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Can 3-Phase Computed Tomography Urography Be Used to Characterize Adrenal Nodules? Results in 145 Patients. J Comput Assist Tomogr 2023; 47:00004728-990000000-00137. [PMID: 36790904 DOI: 10.1097/rct.0000000000001438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE The aim of the study is to determine whether computed tomography (CT) urography (CTU) can characterize incidental adrenal nodules. METHODS This retrospective cohort study was performed at an academic medical center. Patients were identified by free text search of CTU reports that contained the terms "adrenal mass" "adrenal nodule" and "adrenal lesion." Computed tomography urography technique consisted of unenhanced images and postcontrast images obtained at 100 seconds and 15 minutes. The final cohort included 145 patients with 151 adrenal nodules. Nodules were considered lipid-rich adenomas or myelolipomas based on unenhanced imaging characteristics. Absolute and relative washout values were calculated for the remaining nodules, using a cutoff of 60% and 40%, respectively, to diagnose adenomas. Reference standard for lipid-poor adenomas and malignant nodules was histopathology or imaging/clinical follow-up. Mann-Whitney U test was used for comparison of continuous variables, and Fisher exact test was used for categorical variables. RESULTS One hundred nodules were lipid-rich adenomas and 3 were myelolipomas. Forty-eight nodules were indeterminate at unenhanced CT, corresponding to 39 lipid-poor adenomas and 9 malignant nodules based on reference standards. Both absolute and relative washout correctly characterized 71% of nodules (34/48), with a sensitivity of 67% and specificity of 89%. Overall, 91% of all adrenal nodules (137/151) were correctly characterized by CTU alone. Lipid-poor adenomas were smaller than malignant nodules (P < 0.01) and were lower in attenuation on unenhanced and delayed images (P < 0.01). CONCLUSIONS Adrenal nodules detected at 3-phase CTU can be accurately characterized, potentially eliminating the need for subsequent adrenal protocol CT or magnetic resonance imaging.
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Rezkallah EMN, Hanna RS, Elsaify WM. Adrenal Lymphoma: Case Reports and Mini-review. Int J Endocrinol Metab 2022; 20:e128386. [PMID: 36714190 PMCID: PMC9871959 DOI: 10.5812/ijem-128386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 06/29/2022] [Accepted: 07/11/2022] [Indexed: 02/01/2023] Open
Abstract
INTRODUCTION Adrenal lymphoma is a rare condition which may occur in one of two forms; either as primary adrenal lymphoma (PAL), or secondary to a systemic lymphoma. Primary adrenal lymphoma is a very rare diagnosis and the most common histological pattern is diffuse large B-cell non‑Hodgkin lymphoma. OBJECTIVES In this study, we represent two examples of adrenal lymphoma, primary and secondary. In addition, we have included a mini-review of the literature regarding this rare presentation. PATIENTS AND METHODS We retrospectively reviewed all patients who were diagnosed with adrenal lymphoma in our hospital. We represent mainly the most two challenging cases where adrenal surgery was required to confirm the diagnosis. We have included a mini-review of the literature (PubMed data base: 1990 - 2020) on the clinical presentation and management of adrenal lymphoma cases. RESULTS Seventeen patients had adrenal lymphoma in our hospital; 16 of them had secondary involvement of the adrenal gland, while the last one had primary adrenal lymphoma. Patients with adrenal lymphoma mainly present with fever, lumbar pain, and/or symptoms of adrenal insufficiency. Primary adrenal lymphoma usually appears as heterogeneous complex large masses with low density on computerized tomography (CT) scan or magnetic resonance imaging (MRI); however, there is no pathognomonic features to diagnose PAL. The diagnosis is confirmed only with tissue biopsy. Chemotherapy is generally the standard treatment for lymphoma, while the role of surgery is limited. CONCLUSIONS The prognosis of these rare cases is generally poor with only about a third of patients achieving partial or complete remission following treatment.
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Affiliation(s)
| | - Ragai Sobhi Hanna
- General Surgery Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Wael Magdy Elsaify
- General Surgery Department, James Cook University Hospital, Middlesbrough, England
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Pan W, Zhang H, Jin S, Li X, Yang J, Zhang B, Dong X, Ma L, Ji W. Development and Validation of a Clinical-Image Model for Quantitatively Distinguishing Uncertain Lipid-Poor Adrenal Adenomas From Nonadenomas. Front Oncol 2022; 12:902991. [PMID: 35912200 PMCID: PMC9326106 DOI: 10.3389/fonc.2022.902991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 06/13/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundThere remains a demand for a practical method of identifying lipid-poor adrenal lesions.PurposeTo explore the predictive value of computed tomography (CT) features combined with demographic characteristics for lipid-poor adrenal adenomas and nonadenomas.Materials and MethodsWe retrospectively recruited patients with lipid-poor adrenal lesions between January 2015 and August 2021 from two independent institutions as follows: Institution 1 for the training set and the internal validation set and Institution 2 for the external validation set. Two radiologists reviewed CT images for the three sets. We performed a least absolute shrinkage and selection operator (LASSO) algorithm to select variables; subsequently, multivariate analysis was used to develop a generalized linear model. The probability threshold of the model was set to 0.5 in the external validation set. We calculated the sensitivity, specificity, accuracy, and area under the receiver operating characteristic curve (AUC) for the model and radiologists. The model was validated and tested in the internal validation and external validation sets; moreover, the accuracy between the model and both radiologists were compared using the McNemar test in the external validation set.ResultsIn total, 253 patients (median age, 55 years [interquartile range, 47–64 years]; 135 men) with 121 lipid-poor adrenal adenomas and 132 nonadenomas were included in Institution 1, whereas another 55 patients were included in Institution 2. The multivariable analysis showed that age, male, lesion size, necrosis, unenhanced attenuation, and portal venous phase attenuation were independently associated with adrenal adenomas. The clinical-image model showed AUCs of 0.96 (95% confidence interval [CI]: 0.91, 0.98), 0.93 (95% CI: 0.84, 0.97), and 0.86 (95% CI: 0.74, 0.94) in the training set, internal validation set, and external validation set, respectively. In the external validation set, the model showed a significantly and non-significantly higher accuracy than reader 1 (84% vs. 65%, P = 0.031) and reader 2 (84% vs. 69%, P = 0.057), respectively.ConclusionsOur clinical-image model displayed good utility in differentiating lipid-poor adrenal adenomas. Further, it showed better diagnostic ability than experienced radiologists in the external validation set.
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Affiliation(s)
- Wenting Pan
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
| | - Huangqi Zhang
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
- *Correspondence: Huangqi Zhang, ; Wenbin Ji,
| | - Shengze Jin
- Department of Radiology, Taizhou Hospital of Zhejiang Province, Shaoxing University, Taizhou, China
| | - Xin Li
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
| | - Jiawen Yang
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
| | - Binhao Zhang
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
| | - Xue Dong
- Department of Radiology, Taizhou Hospital, Zhejiang University, Taizhou, China
| | - Ling Ma
- He Kang Corporate Management (Shanghai) Co.Ltd, Shanghai, China
| | - Wenbin Ji
- Department of Radiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou, China
- *Correspondence: Huangqi Zhang, ; Wenbin Ji,
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Yamauchi FI, Lemos GR, Dubinco A, Paiva OA, Mussi TC, Baroni RH. Enhancement patterns of adrenal nodules on magnetic resonance imaging. Int Braz J Urol 2022; 48:294-302. [PMID: 35170891 PMCID: PMC8932028 DOI: 10.1590/s1677-5538.ibju.2021.0472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 11/05/2021] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE To compare enhancement patterns of typical adrenal adenomas, lipid-poor adenomas, and non-adenomas on magnetic resonance imaging (MRI). MATERIALS AND METHODS Evaluation of adrenal nodules larger than 1.0 cm, with at least 2-year follow-up, evaluated on MRI in January 2007 and December 2016. Two different protocols were included - upper abdomen MRI (delayed phase after 3 minutes) and abdomen and pelvis MRI (delayed phase after 7 minutes) - and nodules were divided in typical adenomas (characterized on out-of-phase MRI sequence), lipid-poor adenomas (based on follow-up imaging stability) and non-adenomas (based on pathological finding or follow-up imaging). T2-weighted and enhancement features were analyzed (absolute and relative washout and enhancement curve pattern), similarly to classic computed tomography equations. RESULTS Final cohort was composed of 123 nodules in 116 patients (mean diameter of 1.8 cm and mean follow up time of 4 years and 3 months). Of them, 98 (79%) nodules had features of typical adenomas by quantitative chemical shift imaging, and demonstrated type 3 curve pattern in 77%, mean absolute and relative washout of 29% and 16%, respectively. Size, oncologic history and T2-weighted features showed statistically significant differences among groups. Also, a threshold greater than 11.75% for absolute washout on MRI achieved sensitivity of 71.4% and specificity of 70.0%, in differentiating typical adenomas from non-adenomas. CONCLUSION Calculating absolute washout of adrenal nodules on MRI may help identifying proportion of non-adenomas.
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Affiliation(s)
- Fernando Ide Yamauchi
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
| | - George Ramos Lemos
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
| | - André Dubinco
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
| | - Omir Antunes Paiva
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
| | - Thais Caldara Mussi
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
| | - Ronaldo Hueb Baroni
- Departamento de Radiologia, Hospital Israelita Albert Einstein, São Paulo, SP, Brasil
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Stanzione A, Verde F, Galatola R, Romeo V, Liuzzi R, Mainenti PP, Aprea G, Klain M, Guadagno E, Del Basso De Caro M, Maurea S. Qualitative Heterogeneous Signal Drop on Chemical Shift (CS) MR Imaging: Correlative Quantitative Analysis between CS Signal Intensity Index and Contrast Washout Parameters Using T1-Weighted Sequences. Tomography 2021; 7:961-971. [PMID: 34941651 PMCID: PMC8709007 DOI: 10.3390/tomography7040079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 12/16/2022] Open
Abstract
The aim of this study was to calculate MRI quantitative parameters extracted from chemical-shift (CS) and dynamic contrast-enhanced (DCE) T1-weighted (T1-WS) images of adrenal lesions (AL) with qualitative heterogeneous signal drop on CS T1-WS and compare them to those of AL with homogeneous or no signal drop on CS T1-WS. On 3 T MRI, 65 patients with a total of 72 AL were studied. CS images were qualitatively assessed for grouping AL as showing homogeneous (Group 1, n = 19), heterogeneous (Group 2, n = 23), and no (Group 3, n = 30) signal drop. Histopathology or follow-up data served as reference standard to classify AL. ROIs were drawn both on CS and DCE images to obtain adrenal CS signal intensity index (ASII), absolute (AWO), and relative washout (RWO) values. Quantitative parameters (QP) were compared with ANOVA analysis and post hoc Dunn’s test. The performance of QP to classify AL was assessed with receiver operating characteristic analysis. CS ASII values were significantly different among the three groups (p < 0.001) with median values of 71%, 53%, and 3%, respectively. AWO/RWO values were similar in Groups 1 (adenomas) and 2 (benign AL) but significantly (p < 0.001) lower in Group 3 (20 benign AL and 10 malignant AL). With cut-offs, respectively, of 60% (Group 1 vs. 2), 20% (Group 2 vs. 3), and 37% (Group 1 vs. 3), CS ASII showed areas under the curve of 0.85, 0.96, and 0.93 for the classification of AL, overall higher than AWO/RWO. In conclusion, AL with qualitative heterogeneous signal drop at CS represent benign AL with QP by DCE sequence similar to those of AL with homogeneous signal drop at CS, but different to those of AL with no signal drop at CS; ASII seems to be the only quantitative parameter able to differentiate AL among the three different groups.
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Affiliation(s)
- Arnaldo Stanzione
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Francesco Verde
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Roberta Galatola
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
- Correspondence: ; Tel.: +39-0817463560; Fax: +39-0815457081
| | - Valeria Romeo
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Raffaele Liuzzi
- Institute of Biostructures and Bioimaging, The National Research Council (CNR), 80131 Naples, Italy; (R.L.); (P.P.M.)
| | - Pier Paolo Mainenti
- Institute of Biostructures and Bioimaging, The National Research Council (CNR), 80131 Naples, Italy; (R.L.); (P.P.M.)
| | - Giovanni Aprea
- Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80131 Naples, Italy;
| | - Michele Klain
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Elia Guadagno
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Marialaura Del Basso De Caro
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
| | - Simone Maurea
- Department of Advanced Biomedical Sciences, University of Naples “Federico II”, 80131 Naples, Italy; (A.S.); (F.V.); (V.R.); (M.K.); (E.G.); (M.D.B.D.C.); (S.M.)
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Dobrindt EM, Saeger W, Bläker H, Mogl MT, Bahra M, Pratschke J, Rayes N. The challenge to differentiate between sarcoma or adrenal carcinoma—an observational study. Rare Tumors 2021; 13:20363613211057746. [PMID: 34917301 PMCID: PMC8669116 DOI: 10.1177/20363613211057746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Adrenal sarcomas are rare malignant tumors with structural and clinical similarities to sarcomatoid adrenocortical carcinoma. Preoperative diagnosis of tumors of the adrenal gland can be challenging and often misleading thus detaining patients from appropriate oncological strategies. Objective This analysis of a case series evaluated the predictive capability of the primary clinical diagnosis in case of malignancies of the adrenal gland. Methods Thirty two patients were treated from 2009 to 2015 at our clinic and analyzed retrospectively. All patients had computed tomography and/or magnet resonance imaging and a primary histopathological examination at our institution after surgery. Ten questionable cases were surveyed by a reference pathologist. Results Twelve out of 32 diagnoses had to be revised (37.5%). Only 15 out of 24 tumors primarily classified as adrenocortical carcinoma were finally described as primary adrenal cancer. We found two leiomyosarcomas, one liposarcoma, one sarcomatoid adrenocortical carcinoma, and one epitheloid angiosarcoma among 12 misleading diagnoses. Other tumors turned out to be metastases of lung, hepatocellular, and neuroendocrine tumors. Larger tumors were significantly more often correctly diagnosed compared to smaller tumors. Four patients of the group of revised diagnoses died whereas all patients with confirmed diagnoses survived during the follow-up. Conclusion Preoperative assessment of tumors of the adrenal gland is still challenging. In case of wrong primary diagnosis, the prognosis could be impaired due to inadequate surgical procedures or insufficient preoperative oncological treatment.
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Affiliation(s)
- Eva M Dobrindt
- Department of Surgery, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Wolfgang Saeger
- Institute of Pathology, University of Hamburg, Hamburg, Germany
| | - Hendrik Bläker
- Institute of Pathology, University of Leipzig, Leipzig, Germany
| | - Martina T Mogl
- Department of Surgery, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Marcus Bahra
- Department of Surgery, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Johann Pratschke
- Department of Surgery, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Nada Rayes
- Department of Surgery, Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
- Department of General, Visceral, Thoracic and Transplant Surgery, University of Leipzig, Leipzig, Germany
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Mody RN, Remer EM, Nikolaidis P, Khatri G, Dogra VS, Ganeshan D, Gore JL, Gupta RT, Heilbrun ME, Lyshchik A, Mayo-Smith WW, Purysko AS, Savage SJ, Smith AD, Wang ZJ, Wolfman DJ, Wong-You-Cheong JJ, Yoo DC, Lockhart ME. ACR Appropriateness Criteria® Adrenal Mass Evaluation: 2021 Update. J Am Coll Radiol 2021; 18:S251-S267. [PMID: 34794587 DOI: 10.1016/j.jacr.2021.08.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 08/26/2021] [Indexed: 11/24/2022]
Abstract
The appropriate evaluation of adrenal masses is strongly dependent on the clinical circumstances in which it is discovered. Adrenal incidentalomas are masses that are discovered on imaging studies that have been obtained for purposes other than adrenal disease. Although the vast majority of adrenal incidentalomas are benign, further radiological and biochemical evaluation of these lesions is important to arrive at a specific diagnosis. Patients with a history of malignancy or symptoms of excess hormone require different imaging evaluations than patients with incidentalomas. This document reviews imaging approaches to adrenal masses and the various modalities utilized in evaluation of adrenal lesions. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment.
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Affiliation(s)
| | - Rekha N Mody
- Department of Radiology, Cleveland Clinic, Cleveland, Ohio.
| | - Erick M Remer
- Cleveland Clinic, Cleveland, Ohio; Chair, Gaps And Harmonization Committee, ACR Appropriateness Criteria; Portfolio Director, Society of Abdominal Radiology; Chair, Section Urinary Imaging, Scientific Program Committee, American Roentgen Ray Society
| | - Paul Nikolaidis
- Panel Chair, Northwestern University, Chicago, Illinois; Vice-Chair, Operations - Diagnostic Imaging, Northwestern University
| | - Gaurav Khatri
- Panel Vice-Chair, UT Southwestern Medical Center, Dallas, Texas
| | - Vikram S Dogra
- University of Rochester Medical Center, Rochester, New York; and Chair, Penile Performance Consensus Statement
| | | | - John L Gore
- University of Washington, Seattle, Washington; American Urological Association
| | - Rajan T Gupta
- Duke University Medical Center, Durham, North Carolina; and Chair, ACR Meetings Sub-committee, Commission on Publications and Lifelong Learning
| | - Marta E Heilbrun
- Vice-Chair for Quality, Emory Radiology Department, Emory University School of Medicine, Atlanta, Georgia; and RSNA Structured Reporting Subcommittee Chair
| | - Andrej Lyshchik
- Thomas Jefferson University Hospital, Philadelphia, Pennsylvania; Board Member, ICUS
| | | | | | - Stephen J Savage
- Medical University of South Carolina, Charleston, South Carolina; American Urological Association
| | - Andrew D Smith
- University of Alabama at Birmingham, Birmingham, Alabama
| | - Zhen J Wang
- University of California San Francisco School of Medicine, San Francisco, California
| | - Darcy J Wolfman
- Clinical Director, Ultrasound Hopkins NCR; and Committee Chair, ACR US Accreditation Johns Hopkins University School of Medicine, Washington, District of Columbia
| | - Jade J Wong-You-Cheong
- University of Maryland School of Medicine, Baltimore, Maryland; and Vice-Chair Quality and Safety, Diagnostic Radiology, University of Maryland Medical Center
| | - Don C Yoo
- Rhode Island Hospital/The Warren Alpert Medical School of Brown University, Providence, Rhode Island
| | - Mark E Lockhart
- Speciatly Chair, University of Alabama at Birmingham, Birmingham, Alabama; Chair, Radiology Departmental Appointments, Promotions, and Tenure Committee, and Departmental Chief, Genitourinary Imaging, University of Alabama at Birmingham, Birmingham, Alabama; Chair, ACR Appropriateness Committee; Chair, Society of Radiologists in Ultrasound, Annual Meeting Program Committee; and Chair, Research Committee of AIUM Future Fund
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Nagayama Y, Inoue T, Kato Y, Tanoue S, Kidoh M, Oda S, Nakaura T, Hirai T. Relative Enhancement Ratio of Portal Venous Phase to Unenhanced CT in the Diagnosis of Lipid-poor Adrenal Adenomas. Radiology 2021; 301:360-368. [PMID: 34463552 DOI: 10.1148/radiol.2021210231] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Background The development of an accurate, practical, noninvasive, and widely available diagnostic approach to characterize lipid-poor adrenal lesions (greater than 10 HU at unenhanced CT) remains an ongoing demand. Purpose To investigate whether combined assessment of unenhanced and portal venous phase CT allows for the differentiation of lipid-poor adrenal adenomas from nonadenomas. Materials and Methods Patients with lipid-poor adrenal lesions who underwent unenhanced and portal venous phase CT with a single-energy scanner between January 2016 and March 2020 were identified retrospectively. For each lesion, the unenhanced and contrast-enhanced attenuation were measured; the absolute enhancement (contrast-enhanced minus unenhanced attenuation [HU]) and relative enhancement ratio ([absolute enhancement divided by unenhanced attenuation] × 100%) were calculated. The sensitivity achieved at 95% specificity to distinguish adenomas from nonadenomas was determined with receiver operating characteristic curve analysis and compared among parameters with use of the McNemar test. Results A total of 220 patients (mean age ± standard deviation, 66 years ± 12; 134 men) with 131 lipid-poor adenomas and 89 nonadenomas were analyzed. The sensitivity (achieved at 95% specificity) of the relative enhancement ratio (86% [113 of 131 adenomas; 95% CI: 79, 92] at a threshold of >210%) was higher than that of unenhanced attenuation (50% [66 of 131 adenomas; 95% CI: 42, 59] at a threshold of ≤21 HU), contrast-enhanced attenuation (3% [four of 131 adenomas; 95% CI: 1, 8] at a threshold of >120 HU), and absolute enhancement (24% [32 of 131 adenomas; 95% CI: 17, 33] at a threshold of >74 HU; all P < .001). The sensitivities of the relative enhancement ratio were 100% (58 of 58 adenomas; 95% CI: 94, 100), 83% (52 of 63 adenomas; 95% CI: 71, 91), and 30% (three of 10 adenomas; 95% CI: 7, 65) for adenomas measuring unenhanced attenuation of more than 10 HU up to 20 HU, 21-30 HU, and more than 30 HU, respectively. Conclusion A relative enhancement ratio threshold of greater than 210%, measured at unenhanced and portal venous phase CT, accurately differentiated lipid-poor adenomas from nonadenomas, particularly for lesions with unenhanced attenuation of 10-30 HU. © RSNA, 2021 Online supplemental material is available for this article.
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Affiliation(s)
- Yasunori Nagayama
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Taihei Inoue
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Yuki Kato
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Shota Tanoue
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Masafumi Kidoh
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Seitaro Oda
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Takeshi Nakaura
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
| | - Toshinori Hirai
- From the Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto 860-8556, Japan
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Suzuki A, Kamata Y, Taguchi T, Takano K, Yamazaki Y, Sasano H, Shichiri M. A case of adrenocortical adenoma harboring venous thrombus mimicking adrenal malignancy. Endocr J 2021; 68:857-863. [PMID: 33658437 DOI: 10.1507/endocrj.ej20-0667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Advances in imaging technology and its widespread use have increased the number of identified patients with bilateral adrenal incidentalomas. The pathology of bilateral adrenal incidentalomas is gradually elucidated by its increased frequency. Although there is no consensus regarding the optimal management of bilateral adrenal lesions, adrenal lesions that are a suspected adrenocortical carcinoma on the basis of radiological imaging require surgical resection. We report a clinically interesting case of a 59-year-old female with adrenocortical adenoma harboring venous thrombus that mimicked adrenal malignancy. She was referred for evaluation of asymptomatic asymmetric lesions on both adrenal glands. Abdominal computed tomography and magnetic resonance imaging showed a 4.7-cm-diameter heterogenous lesion with peripheral enhancement in the right adrenal gland and a 2.0-cm-diameter homogenous lesion in the left adrenal gland. Adrenal scintigraphy with 131I-adosterol exhibited marked accumulation in the left lesion and slight accumulation in the middle inferior portion of the right lesion. Endocrine data revealed subclinical Cushing syndrome, and the patient underwent right laparoscopic adrenalectomy. The serum cortisol level was not suppressed on an overnight dexamethasone suppression test after the adrenalectomy. The resected tumor revealed a cortisol-producing adrenocortical adenoma harboring an organized and re-canalized venous thrombus, which was associated with focal papillary endothelial hyperplasia. This case illustrates the difficulty with preoperatively diagnosing this heterogeneously enhanced large benign adrenal lesion and differentiating it from adrenocortical carcinoma or angiosarcoma.
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Affiliation(s)
- Agena Suzuki
- Department of Endocrinology, Diabetes and Metabolism, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Yuji Kamata
- Department of Endocrinology, Diabetes and Metabolism, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Tomomi Taguchi
- Department of Endocrinology, Diabetes and Metabolism, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Koji Takano
- Department of Endocrinology, Diabetes and Metabolism, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Yuto Yamazaki
- Department of Pathology, Tohoku University School of Medicine, Sendai, Miyagi 980-8575, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University School of Medicine, Sendai, Miyagi 980-8575, Japan
| | - Masayoshi Shichiri
- Department of Endocrinology, Diabetes and Metabolism, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
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Handcrafted MRI radiomics and machine learning: Classification of indeterminate solid adrenal lesions. Magn Reson Imaging 2021; 79:52-58. [PMID: 33727148 DOI: 10.1016/j.mri.2021.03.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/16/2020] [Accepted: 03/11/2021] [Indexed: 12/16/2022]
Abstract
PURPOSE To assess a radiomic machine learning (ML) model in classifying solid adrenal lesions (ALs) without fat signal drop on chemical shift (CS) as benign or malignant. METHOD 55 indeterminate ALs (21 lipid poor adenomas, 15 benign pheocromocytomas, 1 oncocytoma, 12 metastases, 6 primary tumors) showing no fat signal drop on CS were retrospectively included. Manual 3D segmentation on T2-weighted and CS images was performed for subsequent radiomic feature extraction. After feature stability testing and an 80-20% train-test split, the train set was balanced via oversampling. Following a multi-step feature selection, an Extra Trees model was tuned with 5-fold stratified cross-validation in the train set and then tested on the hold-out test set. RESULTS A total of 3396 features were extracted from each AL, of which 133 resulted unstable while none had low variance (< 0.01). Highly correlated (r > 0.8) features were also excluded, leaving 440 parameters. Among these, Support Vector Machine 5-fold stratified cross-validated recursive feature elimination selected a subset of 6 features. ML obtained a cross-validation accuracy of 0.94 on the train and 0.91 on the test sets. Precision, recall and F1 score were respectively 0.92, 0.91 and 0.91. CONCLUSIONS Our MRI handcrafted radiomics and ML pipeline proved useful to characterize benign and malignant solid indeterminate adrenal lesions.
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Preresection Radiologic Assessment and Imaging Features of 156 Pathologically Proven Adrenal Adenomas. J Comput Assist Tomogr 2020; 44:419-425. [PMID: 32345808 DOI: 10.1097/rct.0000000000001018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The aims of the study were to assess the typical and atypical radiologic features of pathologically proven adrenal adenomas and to determine the relationship between the radiologic and histopathologic classification. METHODS We retrospectively studied 156 pathologically proven adrenal adenomas in 154 patients from our institutional databases who have computed tomography (CT) and/or magnetic resonance imaging (MRI) examinations before intervention. We determined the histopathologic diagnosis (typical or atypical) using Weiss scoring and classified the adenomas radiologically into typical, atypical, or indeterminate based on lesion size, precontrast CT attenuation, absolute percentage washout, calcification, and necrosis. The κ statistic was used to assess the agreement between radiologists. The Fisher exact test was used to compare the radiologic and pathological classifications. RESULTS In consensus, there were 83 typical, 42 atypical, and 31 indeterminate adrenal lesions. Logistic regression model showed that radiologically atypical adenoma was significantly associated with larger size, lobulated shape, higher unenhanced CT attenuation, heterogeneous appearance, nonfunctioning status, absolute percentage washout of less than 60%, and a signal intensity index of less than 16.5%.Pathologically, 147 adenomas were pathologically typical (Weiss 0), and 9 adenomas were pathologically atypical (Weiss 1-2). Radiologically, there was substantial agreement between both readers, with Cohen κ at 0.71. Approximately 98% of radiologically typical adenomas were pathologically typical. Only 17% of radiologically atypical adenomas were pathologically atypical. All radiologically indeterminate adenomas were pathologically typical. However, some of the radiologically indeterminate and typical adenomas still had an atypical component on pathologic analysis, such as necrosis, nuclear atypia, or oncocytic features. CONCLUSIONS Radiologically atypical lesion was significantly associated with larger size and higher unenhanced CT attenuation. Approximately 27% of the cases demonstrated atypical features on imaging. Most radiologically atypical adrenal adenomas are pathologically typical.
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Dalavia CC, Goldman SM, Melo HJDFE, Kater CE, Szejnfeld J, Iared W, Ajzen SA. The value of signal intensity on T1-weighted chemical shift magnetic resonance imaging combined with proton magnetic resonance spectroscopy for the diagnosis of adrenal adenomas. Radiol Bras 2020; 53:86-94. [PMID: 32336823 PMCID: PMC7170587 DOI: 10.1590/0100-3984.2019.0095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Objective To investigate the advantages of using modified signal intensity measurements on chemical shift imaging alone or in conjunction with proton magnetic resonance spectroscopy in the differential diagnosis of adrenal adenomas. Materials and Methods This was a prospective study involving 97 patients with adrenal nodules or masses. The signal intensity index (SII) was calculated as [(signal intensity on the in-phase image − signal intensity on the out-of-phase image) ∕ (signal intensity on the in-phase image)] × 100%. We determined the averages of the minimum, mean, and maximum signal intensity values measured on three consecutive images. When that was not possible (for smaller lesions), we used one or two images. We employed a region of interest that covered one half to two thirds of the mass. All indices were compared with metabolite ratios derived from spectroscopy: lactate/creatine; glutamine-glutamate/creatine; choline/creatine; choline/lipid; 4.0-4.3 ppm/Cr; and lipid/creatine. Results Of the 97 patients evaluated, 69 were diagnosed with adenomas and 28 were diagnosed with nonadenomas. All SII measurements and spectroscopy-derived metabolite ratios were significant to the differentiation between adenomas and nonadenomas, except for the lipid/creatine and choline/lipid ratios. In 37.8% of the cases, it was not possible to perform spectroscopy. When it was possible, the lactate/creatine ratio was found to have higher accuracy than did the SII. Conclusion Determining the SII and metabolite ratios increased the accuracy of the differential diagnosis of adrenal adenomas.
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Affiliation(s)
- Claudio Carvalho Dalavia
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
| | - Suzan Menasce Goldman
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
| | | | - Claudio Elias Kater
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
| | - Jacob Szejnfeld
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
| | - Wagner Iared
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
| | - Sergio Aron Ajzen
- Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil
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Nepal P, Ojili V, Tirumani SH, Gunabushanam G, Nagar A. A pictorial review of non-traumatic adrenergic crisis. Emerg Radiol 2020; 27:533-545. [PMID: 32300900 DOI: 10.1007/s10140-020-01777-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 04/01/2020] [Indexed: 10/23/2022]
Abstract
Non-traumatic adrenal crisis is a rare but critical diagnosis to make in emergency settings due to grave consequences. Various pathologies can present as acute crisis, such as spectrum of endocrine imbalance, ranging from catecholamine excess in pheochromocytomas to acute adrenal insufficiency related to glandular dysfunction. Critical manifestations may be due to structural causes related to adrenal hemorrhage, especially when they are bilateral. Oncological complications such as vascular invasion, tumoral bleed, rupture, and hormonal dysfunction can occur. Due to non-specific clinical presentation, these conditions may come as a surprise on imaging performed for other reasons. Recognition of these imaging findings is critical for appropriate patient management. Although there are few articles discussing non-traumatic emergencies in literature, this review is inclusive of all possible etiologies, thus provides a holistic approach and insight into each situation. Specific imaging approach is needed to tailor the diagnosis. This article will also discuss about the advanced imaging techniques that will complement diagnosis.
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Affiliation(s)
- Pankaj Nepal
- St. Vincent's Medical Center, Bridgeport, CT, USA
| | | | - Sree Harsha Tirumani
- University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | | | - Arpit Nagar
- Ohio State University Wexner Medical Center, Columbus, OH, USA
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Mohamed RE, Abodewan KAEW, Amin MA. Diagnostic value of delayed washout rate of contrast-enhanced multi-detector computed tomography in adrenal incidentalomas. ALEXANDRIA JOURNAL OF MEDICINE 2019. [DOI: 10.1016/j.ajme.2013.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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The role of dynamic post-contrast T1-w MRI sequence to characterize lipid-rich and lipid-poor adrenal adenomas in comparison to non-adenoma lesions: preliminary results. Abdom Radiol (NY) 2018; 43:2119-2129. [PMID: 29214448 DOI: 10.1007/s00261-017-1429-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
PURPOSE The purpose of the article is to compare the features of wash-out (WO) parameters between lipid-rich and lipid-poor adrenal adenomas as well as with a group of non-adenoma adrenal lesions. METHODS 46 patients (36 F and 10 M, median age 58 years) with unilateral adrenal lesions (35 adenomas, 7 pheochromocytomas, 1 carcinoma, and 3 metastases) were prospectively evaluated; adrenal lesions were divided into adenomas (Group 1) and non-adenomas (Group 2). MR imaging was performed with a 3-Tesla scanner using pre- and post-contrast dedicated sequences. On the basis of the evaluation of qualitative chemical-shift (CS) signal intensity (SI) loss, adrenal adenomas were, respectively, divided in Group 1A (n = 25) as lipid-rich and Group 1B (n = 10) as lipid-poor; non-adenoma adrenal lesions were grouped in Group 2 (n = 11). The following parameters were evaluated: size (mm), CS SI index (%), early (5 min), and delayed (10 min) Relative (R) and Absolute (A) WO values (%). RESULTS The comparison of AWO and RWO showed significant (p ≤ 0.05) differences between Group 1A and Groups 1B and 2, both using 5- and 10-min images for calculation; conversely, no differences in these dynamic parameters were found between Group 1B and 2; AWO and RWO values were significantly lower in adrenal lesions of Groups 1B and 2 compared to Group 1A, both using 5- and 10-min images for calculation. CONCLUSIONS The quantitative evaluation of WO parameters could not be used to characterize lipid-poor adrenal adenomas for which alternative imaging modalities are required.
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Abstract
Fatty liver disease is characterized histologically by hepatic steatosis, the abnormal accumulation of lipid in hepatocytes. It is classified into alcoholic fatty liver disease and nonalcoholic fatty liver disease, and is an increasingly important cause of chronic liver disease and cirrhosis. Assessing the severity of hepatic steatosis in these conditions is important for diagnostic and prognostic purposes, as hepatic steatosis is potentially reversible if diagnosed early. The criterion standard for assessing hepatic steatosis is liver biopsy, which is limited by sampling error, its invasive nature, and associated morbidity. As such, noninvasive imaging-based methods of assessing hepatic steatosis are needed. Ultrasound and computed tomography are able to suggest the presence of hepatic steatosis based on imaging features, but are unable to accurately quantify hepatic fat content. Since Dixon's seminal work in 1984, magnetic resonance imaging has been used to compute the signal fat fraction from chemical shift-encoded imaging, commonly implemented as out-of-phase and in-phase imaging. However, signal fat fraction is confounded by several factors that limit its accuracy and reproducibility. Recently, advanced chemical shift-encoded magnetic resonance imaging methods have been developed that address these confounders and are able to measure the proton density fat fraction, a standardized, accurate, and reproducible biomarker of fat content. The use of these methods in the liver, as well as in other abdominal organs such as the pancreas, adrenal glands, and adipose tissue will be discussed in this review.
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Chemical shift imaging for evaluation of adrenal masses: a systematic review and meta-analysis. Eur Radiol 2018; 29:806-817. [PMID: 30014203 DOI: 10.1007/s00330-018-5626-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 06/13/2018] [Accepted: 06/21/2018] [Indexed: 12/27/2022]
Abstract
OBJECTIVES To perform a systematic review and meta-analysis of published data to evaluate the utility of chemical shift imaging (CSI) for differentiating between adrenal adenomas and non-adenomas. METHODS A systematic search of the MEDLINE, Web of Science Core Collection, EMBASE and Cochrane Central Register of Controlled Trials electronic databases was performed. The methodological quality of the included studies was assessed by using the QUADAS-2 (Quality Assessment of Diagnostic Accuracy Studies) tool. A bivariate random effect model was used to determine summary and subgroup sensitivity and specificity and calculate summary receiver operating characteristic curves (SROC). RESULTS Eighteen studies with 1138 patients and 1280 lesions (859 adenomas, 421 non-adenomas) in total were included. In addition to summary analysis, quantitative analyses of the adrenal signal intensity index (SII, 978 lesions, 14 studies), adrenal-to-spleen ratio (ASR; 394 lesions, 7 studies) and visual analysis (560 lesions, 5 studies) were performed. The resultant data showed considerable heterogeneity (inconsistency index I2 of 94%, based on the diagnostic odds ratio, DOR). The pooled sensitivity of CSI for adenoma was 0.94 [95% confidence interval (CI) 0.88-0.97] and pooled specificity was 0.95 (95% CI 0.89-0.97). The area (AUC) under the SROC curve was 0.98 (95% CI 0.96-0.99). The corresponding AUCs were 0.98, 0.99 and 0.95 for SII, ASR and visual evaluation, respectively. CONCLUSION CSI has high sensitivity, specificity and accuracy for adrenal adenoma. Diagnostic performance does not improve when quantitative indices are used. KEY POINTS • Inclusion of CSI in abdominal MRI protocols provides an effective solution for classifying adrenal masses discovered on MR exams • Visual evaluation of adrenal CSI is sufficient; use of quantitative indices does not improve diagnostic accuracy.
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Morelli V, Palmieri S. Adrenal incidentaloma: differential diagnosis and management strategies. MINERVA ENDOCRINOL 2018; 44:4-18. [PMID: 29808642 DOI: 10.23736/s0391-1977.18.02868-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Adrenal incidentaloma is a frequent clinical finding. Once an adrenal mass is detected, is mandatory to determine whether the lesion is malignant or benign and whether it is hormonally active or non-functioning, to estabilish an adequate treatement or follow-up. The European Society of Endocrinology and ENSAT Guideline recently provided the best recommendation based on the available literature. However, due to the retrospective design of the majority of the studies, the small number of patients included and the inadequate follow-up, some issues are still unresolved. In particular, there is a general consensus about the need of adrenalectomy in the presence of unilateral adrenal mass and clinically relevant hormone excess or radiological findings suspected for malignancy. On the other side, how to manage adrenal masses with indeterminate characteristics or subtle cortisol secretion, and how long the radiological and functional follow-up of benign adrenal mass should last in non-operated patients, are still open questions. Therefore, high-quality research for establish the adequate management of these patients and randomized clinical trials are needed to avoid unnecessary investigations and invasive procedures and ensure a clinically effective work-up.
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Affiliation(s)
- Valentina Morelli
- Unit of Endocrinology, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milan, Italy -
| | - Serena Palmieri
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
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Kim SJ, Lee SW, Pak K, Kim IJ, Kim K. Diagnostic accuracy of 18F-FDG PET or PET/CT for the characterization of adrenal masses: a systematic review and meta-analysis. Br J Radiol 2018; 91:20170520. [PMID: 29327944 DOI: 10.1259/bjr.20170520] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVE We aimed to explore the role of the diagnostic accuracy of 18F fluodeoxyglucose PET (18F-FDG PET) or PET/CT for characterization of adrenal lesions through a systematic review and meta-analysis. METHODS The MEDLINE, EMBASE, and Cochrane Library database, from the earliest available date of indexing through 30 April 2017, were searched for studies evaluating the diagnostic performance of 18F-FDG PET or PET/CT for characterization of adrenal lesions. We determined the sensitivities and specificities across studies, calculated positive and negative likelihood ratios (LR + and LR-), and constructed summary receiver operating characteristic curves. RESULTS Across 29 studies (2421 patients), the pooled sensitivity for 18F-FDG PET or PET/CT was 0.91 [95% CI (0.88-0.94)] with heterogeneity (χ2 = 141.8, p = 0.00) and a pooled specificity of 0.91 [95% CI (0.87-0.93)] with heterogeneity (χ2 = 113.7, p = 0.00). Likelihood ratio (LR) syntheses gave an overall positive likelihood ratio (LR+) of 9.9 [95% CI (7.1-13.7)] and negative likelihood ratio (LR-) of 0.09 [95% CI (0.07-0.13)]. The pooled diagnostic odds ratio was 105 [95% CI (63-176)]. In metaregression analysis, study design, publication year, study location (western vs others), interpretation criteria of PET or PET/CT images, quantification of PET or PET/CT [SUVmax (maximum standardized uptake value) vs SUV (standardized uptake value) ratio], patient group, and analysis method (patient-based vs lesion-based) were the sources of the study heterogeneity. However, in multivariate metaregression, no definite variable was the source of the study heterogeneity. CONCLUSION 18F-FDG PET or PET/CT demonstrated good sensitivity and specificity for the characterization of adrenal masses. At present, the literature regarding the use of 18F-FDG PET or PET/CT for the characterization of adrenal masses remains still limited; thus, further large multicenter studies would be necessary to substantiate the diagnostic accuracy of 18F-FDG PET or PET/CT characterization of adrenal masses. Advances in knowledge: 18F- FDG PET or PET/CT showed good sensitivity and specificity for the characterization of adrenal masses and could provide additional information for that purpose.
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Affiliation(s)
- Seong-Jang Kim
- 1 Department of Nuclear Medicine, Pusan National University Yangsan Hospital , Yangsan , South Korea.,2 BioMedical Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital , Yangsan , South Korea
| | - Sang-Woo Lee
- 3 Department of Nuclear Medicine, Kyungpook National University Medical Center and School of Medicine , Daegu , South Korea
| | - Kyoungjune Pak
- 4 Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital , Busan , South Korea
| | - In-Ju Kim
- 4 Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital , Busan , South Korea
| | - Keunyoung Kim
- 4 Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital , Busan , South Korea
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Melo-Leite AFD, Elias PCL, Teixeira SR, Tucci S, Barros GE, Antonini SR, Muglia VF, Elias J. Adrenocortical neoplasms in adulthood and childhood: distinct presentation. Review of the clinical, pathological and imaging characteristics. J Pediatr Endocrinol Metab 2017; 30:253-276. [PMID: 28170340 DOI: 10.1515/jpem-2016-0080] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 10/05/2016] [Indexed: 12/21/2022]
Abstract
Adrenocortical tumors (ACT) in adulthood and childhood vary in clinical, histopathological, molecular, prognostic, and imaging aspects. ACT are relatively common in adults, as adenomas are often found incidentally on imaging. ACT are rare in children, though they have a significantly higher prevalence in the south and southeast regions of Brazil. In clinical manifestation, adults with ACT present more frequently with glucocorticoid overproduction (Cushing syndrome), mineralocorticoid syndromes (Conn syndrome), or the excess of androgens in women. Subclinical tumors are frequently diagnosed late, associated with compression symptoms of abdominal mass. In children, the usual presentation is the virilizing syndrome or virilizing association and hypercortisolism. Histopathological grading and ACT classification in malignant and benign lesions are different for adults and children. In adults, the described criteria are the Hough, Weiss, modified Weiss, and Van Slooten. These scores are not valid for children; there are other criteria, such as proposed by Wieneke and colleagues. In molecular terms, there is also a difference related to genetic alterations found in these two populations. This review discusses the imaging findings of ACT, aiming to characterize the present differences between ACT found in adults and children. We listed several differences between magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography-computed (PET-CT) and also performed a literature review, which focuses on studied age groups of published articles in the last 10 years regarding cortical neoplasm and imaging techniques. Published studies on ACT imaging in children are rare. It is important to stress that the majority of publications related to the differentiation of malignant and benign tumors are based almost exclusively on studies in adults. A minority of articles, however, studied adults and children together, which may not be appropriate.
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Matos AP, Semelka RC, Herédia V, AlObaidiy M, Gomes FV, Ramalho M. Modified approach to the characterization of adrenal nodules using a standard abdominal magnetic resonance imaging protocol. Radiol Bras 2017; 50:19-25. [PMID: 28298728 PMCID: PMC5347499 DOI: 10.1590/0100-3984.2015.0102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Objective To describe a modified approach to the evaluation of adrenal nodules using a
standard abdominal magnetic resonance imaging protocol. Materials and Methods Our sample comprised 149 subjects (collectively presenting with 132 adenomas
and 40 nonadenomas). The adrenal signal intensity index was calculated.
Lesions were grouped by pattern of enhancement (PE), according to the phase
during which the wash-in peaked: arterial phase (type 1 PE); portal venous
phase (type 2 PE); and interstitial phase (type 3 PE). The relative and
absolute wash-out values were calculated. To test for mean differences
between adenomas and nonadenomas, Student's t-tests were
used. Receiver operating characteristic curve analysis was also
performed. Results The mean adrenal signal intensity index was significantly higher for the
adenomas than for the nonadenomas (p < 0.0001). Chemical
shift imaging showed a sensitivity and specificity of 94.4% and 100%,
respectively, for differentiating adenomas from nonadenomas. Of the
adenomas, 47.6%, 48.5%, and 3.9%, respectively, exhibited type 1, 2, and 3
PEs. For the mean wash-in proportions, significant differences were found
among the enhancement patterns. The wash-out calculations revealed a trend
toward better lesion differentiation for lesions exhibiting a type 1 PE,
showing a sensitivity and specificity of 71.4% and 80.0%, respectively, when
the absolute values were referenced, as well as for lesions exhibiting a
type 2 PE, showing a sensitivity and specificity of 68.0% and 100%,
respectively, when the relative values were referenced. The calculated
probability of a lipid-poor lesion that exhibited a type 3 PE being a
nonadenoma was > 99%. Conclusion Subgrouping dynamic enhancement patterns yields high diagnostic accuracy in
differentiating adenomas from nonadenomas.
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Affiliation(s)
- António P Matos
- Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA, and Hospital Garcia de Orta, Almada, Portugal
| | - Richard C Semelka
- Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Vasco Herédia
- Department of Radiology, Hospital do Espírito Santo, Évora, Portugal
| | - Mamdoh AlObaidiy
- Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA, and King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | | | - Miguel Ramalho
- Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA, and Hospital Garcia de Orta, Almada, Portugal
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Wang X, Li K, Sun H, Zhao J, Zheng L, Zhang Z, Bai R, Zhang G. Differentiation between adrenal adenomas and nonadenomas using dynamic contrast-enhanced computed tomography. Onco Targets Ther 2016; 9:6809-6817. [PMID: 27843331 PMCID: PMC5098566 DOI: 10.2147/ott.s112003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
This study was performed to evaluate the findings including the time density curve (TD curve), the relative percentage of enhancement washout (Washr) and the absolute percentage of enhancement washout (Washa) at dynamic contrast-enhanced computed tomography (DCE-CT) in 70 patients with 79 adrenal masses (including 44 adenomas and 35 nonadenomas) confirmed histopathologically and/or clinically. The results demonstrated that the TD curves of adrenal masses were classified into 5 types, and the type distribution of the TD curves was significantly different between adenomas and nonadenomas. Types A and C were characteristic of adenomas, whereas types B, D and E were features of nonadenomas. The sensitivity, specificity and accuracy for the diagnosis of adenoma based on the TD curves were 93%, 80% and 87%, respectively. Furthermore, when myelolipomas were excluded, the specificity and accuracy for adenoma were 90% and 92%, respectively. The Washr and the Washa values for the adenomas were higher than those for the nonadenomas. The diagnostic efficiency for adenoma was highest at 7-min delay time at DCE-CT; Washr was more efficient than Washa. Washr ≥34% and Washa ≥43% were both suggestive of adenomas and, on the contrary, suspicious of nonadenomas. The sensitivity, specificity and accuracy for the diagnosis of adenoma were 84%, 77% and 81%, respectively. When myelolipomas were precluded, the diagnostic specificity and accuracy were 87% and 85%, respectively. Therefore, DCE-CT aids in characterization of adrenal tumors, especially for lipid-poor adenomas which can be correctly categorized on the basis of TD curve combined with the percentage of enhancement washout.
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Affiliation(s)
- Xifu Wang
- Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai
| | - Kangan Li
- Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai
| | - Haoran Sun
- Department of Radiology, Tianjin Medical University General Hospital, Tianjin, People's Republic of China
| | - Jinglong Zhao
- Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai
| | - Linfeng Zheng
- Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai
| | - Zhuoli Zhang
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Renju Bai
- Department of Radiology, Tianjin Medical University General Hospital, Tianjin, People's Republic of China
| | - Guixiang Zhang
- Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai
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Differentiation of Benign From Metastatic Adrenal Masses in Patients With Renal Cell Carcinoma on Contrast-Enhanced CT. AJR Am J Roentgenol 2016; 207:1031-1038. [DOI: 10.2214/ajr.16.16193] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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El-Kalioubie M, Emad-Eldin S, Abdelaziz O. Diffusion-weighted MRI in adrenal lesions: A warranted adjunct? THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2016. [DOI: 10.1016/j.ejrnm.2016.01.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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Park JJ, Park BK, Kim CK. Adrenal imaging for adenoma characterization: imaging features, diagnostic accuracies and differential diagnoses. Br J Radiol 2016; 89:20151018. [PMID: 26867466 DOI: 10.1259/bjr.20151018] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Adrenocortical adenoma is the most common adrenal tumour. This lesion is frequently encountered on cross-sectional imaging that has been performed for unrelated reasons. Adrenal adenoma manifests various imaging features on CT, MRI and positron emission tomography/CT. The learning objectives of this review are to describe the imaging findings of adrenocortical adenoma, to compare the sensitivities of different imaging modalities for adenoma characterization and to introduce differential diagnoses.
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Affiliation(s)
- Jung Jae Park
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Byung Kwan Park
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Chan Kyo Kim
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
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Adam SZ, Nikolaidis P, Horowitz JM, Gabriel H, Hammond NA, Patel T, Yaghmai V, Miller FH. Chemical Shift MR Imaging of the Adrenal Gland: Principles, Pitfalls, and Applications. Radiographics 2016; 36:414-32. [DOI: 10.1148/rg.2016150139] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Inan N, Arslan A, Donmez M, Sarisoy HT. Diagnostic Accuracy of Dynamic Contrast Enhanced Magnetic Resonance Imaging in Characterizing Lung Masses. IRANIAN JOURNAL OF RADIOLOGY 2016; 13:e23026. [PMID: 27703654 PMCID: PMC5040099 DOI: 10.5812/iranjradiol.23026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 10/02/2014] [Accepted: 12/14/2014] [Indexed: 11/19/2022]
Abstract
Background Imaging plays a critical role not only in the detection, but also in the characterization of lung masses as benign or malignant. Objectives To determine the diagnostic accuracy of dynamic magnetic resonance imaging (MRI) in the differential diagnosis of benign and malignant lung masses. Patients and Methods Ninety-four masses were included in this prospective study. Five dynamic series of T1-weighted spoiled gradient echo (FFE) images were obtained, followed by a T1-weighted FFE sequence in the late phase (5th minutes). Contrast enhancement patterns in the early (25th second) and late (5th minute) phase images were evaluated. For the quantitative evaluation, signal intensity (SI)-time curves were obtained and the maximum relative enhancement, wash-in rate, and time-to-peak enhancement of masses in both groups were calculated. Results The early phase contrast enhancement patterns were homogeneous in 78.2% of the benign masses, while heterogeneous in 74.4% of the malignant tumors. On the late phase images, 70.8% of the benign masses showed homogeneous enhancement, while most of the malignant masses showed heterogeneous enhancement (82.4%). During the first pass, the maximum relative enhancement and wash-in rate values of malignant masses were significantly higher than those of the benign masses (P = 0.03 and 0.04, respectively). The cutoff value at 15% yielded a sensitivity of 85.4%, specificity of 61.2%, and positive predictive value of 68.7% for the maximum relative enhancement. Conclusion Contrast enhancement patterns and SI-time curve analysis of MRI are helpful in the differential diagnosis of benign and malignant lung masses.
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Affiliation(s)
- Nagihan Inan
- Department of Radiology, School of Medicine, University of Kocaeli, Kocaeli, Turkey
- Corresponding author: Nagihan Inan, Department of Radiology, School of Medicine, University of Kocaeli, Kocaeli, Turkey. Tel: +90-2623037242, Fax: +90-2623038003, E-mail:
| | - Arzu Arslan
- Department of Radiology, School of Medicine, University of Kocaeli, Kocaeli, Turkey
| | - Muhammed Donmez
- Department of Radiology, School of Medicine, University of Kocaeli, Kocaeli, Turkey
| | - Hasan Tahsin Sarisoy
- Department of Radiology, School of Medicine, University of Kocaeli, Kocaeli, Turkey
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Becker-Weidman D, Kalb B, Mittal PK, Harri PA, Arif-Tiwari H, Farris AB, Chen Z, Sungjin K, Martin DR. Differentiation of lipid-poor adrenal adenomas from non-adenomas with magnetic resonance imaging: Utility of dynamic, contrast enhancement and single-shot T2-weighted sequences. Eur J Radiol 2015; 84:2045-51. [DOI: 10.1016/j.ejrad.2015.06.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 06/25/2015] [Accepted: 06/28/2015] [Indexed: 11/27/2022]
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Herr K, Muglia VF, Koff WJ, Westphalen AC. Imaging of the adrenal gland lesions. Radiol Bras 2015; 47:228-39. [PMID: 25741090 PMCID: PMC4337123 DOI: 10.1590/0100-3984.2013.1762] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2013] [Accepted: 10/03/2013] [Indexed: 12/21/2022] Open
Abstract
With the steep increase in the use of cross-sectional imaging in recent years, the
incidentally detected adrenal lesion, or "incidentaloma", has become an increasingly
common diagnostic problem for the radiologist, and a need for an approach to
classifying these lesions as benign, malignant or indeterminate with imaging has
spurred an explosion of research. While most incidentalomas represent benign disease,
typically an adenoma, the possibility of malignant involvement of the adrenal gland
necessitates a reliance on imaging to inform management decisions. In this article,
we review the literature on adrenal gland imaging, with particular emphasis on
computed tomography, magnetic resonance imaging, and photon-emission tomography, and
discuss how these findings relate to clinical practice. Emerging technologies, such
as contrast-enhanced ultrasonography, dual-energy computed tomography, and magnetic
resonance spectroscopic imaging will also be briefly addressed.
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Affiliation(s)
- Keith Herr
- MD, Assistant Professor, Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Valdair F Muglia
- MD, Habiliation, Associate Professor, Department of Internal Medicine - Radiology, Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo (FMRP-USP), Ribeirão Preto, SP, Brasil
| | - Walter José Koff
- MD, Habilitation, Full Professor, Department of Surgery - Urology, Faculdade de Medicina da Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Antonio Carlos Westphalen
- MD, PhD, Associate Professor, Departments of Radiology and Biomedical Imaging and Urology, School of Medicine, University of California, San Francisco, CA, USA
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The clinical value of dynamic contrast-enhanced MRI in differential diagnosis of malignant and benign ovarian lesions. Tumour Biol 2015; 36:5515-22. [DOI: 10.1007/s13277-015-3219-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 02/03/2015] [Indexed: 10/23/2022] Open
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Launay N, Silvera S, Tenenbaum F, Groussin L, Tissier F, Audureau E, Vignaux O, Dousset B, Bertagna X, Legmann P. Value of 18-F-FDG PET/CT and CT in the Diagnosis of Indeterminate Adrenal Masses. Int J Endocrinol 2015; 2015:213875. [PMID: 25722719 PMCID: PMC4333271 DOI: 10.1155/2015/213875] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 01/01/2015] [Accepted: 01/07/2015] [Indexed: 12/26/2022] Open
Abstract
The purpose of this paper was to study the value of 18-FDG PET/CT and reassess the value of CT for the characterization of indeterminate adrenal masses. 66 patients with 67 indeterminate adrenal masses were included in our study. CT/MRI images and 18F-FDG PET/CT data were evaluated blindly for tumor morphology, enhancement features, apparent diffusion coefficient values, maximum standardized uptake values, and adrenal-to-liver maxSUV ratio. The study population comprised pathologically confirmed 16 adenomas, 19 metastases, and 32 adrenocortical carcinomas. Macroscopic fat was observed in 62.5% of the atypical adenomas at CT but not in malignant masses. On 18F-FDG PET/CT, SUVmax and adrenal-to-liver maxSUV ratio were significantly lower in adenomas than in malignant tumors. An SUVmax value of less than 3.7 or an adrenal-to-liver maxSUV ratio of less than 1.29 is highly predictive of benignity.
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Affiliation(s)
- Nathalie Launay
- Department of Radiology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- *Nathalie Launay:
| | - Stéphane Silvera
- Department of Radiology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Florence Tenenbaum
- Department of Nuclear Medicine, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Lionel Groussin
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- Department of Endocrinology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Frédérique Tissier
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- Department of Anatomopathology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Etienne Audureau
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- Department of Epidemiology and Biostatistics, Hôtel Dieu University Hospital, 1 Parvis Notre Dame-place Jean Paul II, 75004 Paris, France
| | - Olivier Vignaux
- Department of Radiology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
| | - Bertrand Dousset
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- Department of Digestive and Endocrine Surgery, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Xavier Bertagna
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
- Department of Endocrinology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
| | - Paul Legmann
- Department of Radiology, Cochin University Hospital, 27 rue du Faubourg St. Jacques, 75014 Paris, France
- Sorbonne Paris Cité, Université Paris Descartes, 12 rue de l'École de Medicine, 75006 Paris, France
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Woo S, Cho JY, Kim SY, Kim SH. Adrenal adenoma and metastasis from clear cell renal cell carcinoma: can they be differentiated using standard MR techniques? Acta Radiol 2014; 55:1120-8. [PMID: 24252816 DOI: 10.1177/0284185113512301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Chemical-shift magnetic resonance imaging (MRI) has been known to successfully differentiate adenomas from metastases. However, there has been concern that metastasis from extra-adrenal primary malignancies which contain high lipid content such as clear cell renal cell carcinoma (RCC) could mimic adrenal adenomas. PURPOSE To evaluate the ability of MR to differentiate adrenal adenoma from metastasis using chemical-shift imaging and MR feature analysis in patients with clear cell RCC. MATERIAL AND METHODS This study was institutional review board-approved; informed consent was waived. Eleven patients with 13 metastases and 13 patients with 15 adrenal adenomas in patients with clear cell RCC for evaluation of an adrenal mass underwent MR. Signal intensity on in- and opposed-phases, signal intensity index (SII), size, T2 SI, cystic change, necrosis, and hemorrhage were evaluated. Statistical analyses included Student t-test and Fisher exact test. If available, precontrast CT attenuation of the adrenal adenomas was measured. SII was correlated with attenuation using Pearson correlation coefficient. RESULTS Mean size of adenomas was smaller than that of metastases (P < 0.002). Mean SII of adenomas (45.0% ± 24.6) was significantly greater than that of metastases (6.6% ± 4.7; P < 0.001). With a threshold of 16.5% for SII, the sensitivity, specificity, and accuracy for adenomas were 80%, 100%, and 89.2%, respectively. All six lipid-rich adenomas were diagnosed as adrenal adenoma. Three of eight (37.5%) lipid-poor adenomas were misdiagnosed as metastases. While up to 53.8% (7/13) of the metastases demonstrated cystic change, necrosis, or hemorrhage, only one (6.7%) adenoma exhibited cystic change or necrosis (P < 0.05 for all). Precontrast attenuation and SII were significantly correlated: r = -0.810 (P < 0.001). CONCLUSION In patients with clear cell RCC who underwent MR for adrenal masses, SII and MR features such as cystic change, necrosis, and hemorrhage were helpful in differentiating adenomas from metastases.
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Affiliation(s)
- Sungmin Woo
- Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jeong Yeon Cho
- Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Institute of Radiation Medicine and Kidney Research Institute, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Sang Youn Kim
- Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung Hyup Kim
- Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Institute of Radiation Medicine and Kidney Research Institute, Seoul National University Medical Research Center, Seoul, Republic of Korea
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Emad-Eldin S, El-Kalioubie M. Diagnostic value of combined versus individual MRI parameters in distinguishing adenomatous from non-adenomatous adrenal lesions in cancer patients. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2014. [DOI: 10.1016/j.ejrnm.2014.06.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Abstract
Incidental adrenal neoplasms are usually nonfunctioning benign adenomas. Once hormonal production has been assessed, the nonsecreting lesions must be evaluated for the possibility of malignancy. This evaluation relies primarily on the radiographic characteristics. This article focuses on the current state of radiologic technology available to accurately assess nonfunctioning adrenal incidentalomas. As this technology advances, a lesion's malignant potential can more accurately be determined, thereby allowing physicians to make more informed treatment recommendations.
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Affiliation(s)
- Peter J Mazzaglia
- Department of General Surgery, The Warren Alpert School of Medicine, Brown University, 593 Eddy Street, APC 4, Providence, RI 02905, USA.
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35
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Combined Chemical Shift Imaging With Early Dynamic Serial Gadolinium-Enhanced MRI in the Characterization of Adrenal Lesions. AJR Am J Roentgenol 2014; 203:99-106. [DOI: 10.2214/ajr.13.11731] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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37
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Kim TU, Kim S, Lee JW, Lee NK, Ha HK, Park WY. Myxoid adrenocortical adenoma: magnetic resonance imaging and pathology correlation. Korean J Radiol 2014; 15:245-9. [PMID: 24643431 PMCID: PMC3955791 DOI: 10.3348/kjr.2014.15.2.245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 12/31/2013] [Indexed: 11/15/2022] Open
Abstract
We report a case of a 74-year-old female with myxoid adrenocortical adenoma which showed different magnetic resonance imaging findings compared to those of a typical adrenocortical adenoma. The myxoid change in the adrenocortical adenoma is a rare form of degeneration. It presents a considerable diagnostic challenge to both radiologists and clinicians because it can mimic other adrenal tumor types on imaging. The MRI findings of the presented case included a high signal intensity on T2-weighted images similar to that of fluid and delayed progressive enhancement.
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Affiliation(s)
- Tae Un Kim
- Department of Radiology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan 626-770, Korea
| | - Suk Kim
- Department of Radiology, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan 602-739, Korea
| | - Jun Woo Lee
- Department of Radiology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan 626-770, Korea
| | - Nam Kyung Lee
- Department of Radiology, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan 602-739, Korea
| | - Hong Koo Ha
- Department of Urology, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan 602-739, Korea
| | - Won Young Park
- Department of Pathology, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan 602-739, Korea
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Intraindividual comparison of 123I-mIBG SPECT/MRI, 123I-mIBG SPECT/CT, and MRI for the detection of adrenal pheochromocytoma in patients with elevated urine or plasma catecholamines. Clin Nucl Med 2013; 38:e1-6. [PMID: 22996238 DOI: 10.1097/rlu.0b013e318263923d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
PURPOSE To determine the diagnostic performance of ¹²³I-metaiodobenzylguanidine (mIBG) SPECT/MRI fusion, ¹²³I-mIBG SPECT/CT and adrenal MRI for the detection of pheochromocytoma in patients with elevated urine or plasma catecholamines. PATIENTS AND METHODS Twenty-two consecutive patients underwent both a whole-body ¹²³I-mIBG scan with SPECT/CT of the adrenal region and MRI of the adrenal glands. Fused SPECT/MRI, SPECT/CT, and MRI scans were evaluated. Imaging results were analyzed both on a per-patient and on a per-lesion basis. Histopathology and/or clinical and radiological follow-up served as the reference standard. RESULTS Sixteen adrenal tumors were found in thirteen patients. On a per-lesion basis, SPECT/CT had a sensitivity of 87.5%, a specificity of 93.8%, and an overall accuracy of 92.5%. MRI had a sensitivity of 87.5%, a specificity of 96.9%, and an overall accuracy of 95.0%. On a per-patient basis, both SPECT/CT and MRI had a sensitivity of 85.7%, a specificity of 93.3%, and an overall accuracy of 90.9%. SPECT/CT was concordant with MRI in 81.8% of cases. SPECT/MRI fusion was superior to both SPECT/CT and MRI and had a sensitivity of 100% on both a per-lesion and a per-patient basis. CONCLUSIONS ¹²³I-mIBG SPECT/MRI has the highest sensitivity and accuracy for the detection and localization of pheochromocytomas. SPECT/CT and MRI of the adrenal glands are equivalent diagnostic procedures. However, MRI offers the advantage of fully diagnostic assessment of adrenal lesions other than pheochromocytoma undetectable by ¹²³I-mIBG.
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Korivi BR, Elsayes KM. Cross-sectional imaging work-up of adrenal masses. World J Radiol 2013; 5:88-97. [PMID: 23671745 PMCID: PMC3650209 DOI: 10.4329/wjr.v5.i3.88] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 08/12/2012] [Accepted: 01/31/2013] [Indexed: 02/06/2023] Open
Abstract
Advances in medical imaging with current cross-section modalities enable non-invasive characterization of adrenal lesions. Computed tomography (CT) provides characterization with its non-contrast and wash-out features. Magnetic resonance imaging (MRI) is helpful in further characterization using chemical shift imaging (CSI) and MR spectroscopy. For differentiating between benign and malignant masses, positron emission tomography (PET) imaging is useful with its qualitative analysis, as well as its ability to detect the presence of extra-adrenal metastases in cancer patients. The work-up for an indeterminate adrenal mass includes evaluation with a non-contrast CT. If a lesion is less than 10 Hounsfield Units on a non-contrast CT, it is a benign lipid-rich adenoma and no further work-up is required. For the indeterminate adrenal masses, a lipid-poor adenoma can be differentiated from a metastasis utilizing CT wash-out features. Also, MRI is beneficial with CSI and MR spectroscopy. If a mass remains indeterminate, PET imaging may be of use, in which benign lesions demonstrate low or no fluorodeoxyglucose activity. In the few cases in which adrenal lesions remain indeterminate, surgical sampling such as percutaneous biopsy can be performed.
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The washout rate on the delayed CT image as a diagnostic tool for adrenal adenoma verified by pathology: a multicenter study. Int Urol Nephrol 2012; 44:1397-402. [PMID: 22798018 DOI: 10.1007/s11255-012-0202-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 05/10/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES To establish the undisputed the value of washout rate for adrenal adenoma using delayed enhanced CT, we evaluated diagnostic performance of cut-off value and delayed time of washout rate by final pathologic diagnosis in a multicenter study. METHODS We reviewed the pathologic and clinical records of 244 patients underwent adrenalectomies at 5 university hospitals between 2005 and 2009. We calculated the mean Housfield units (HU) of adrenal lesion at non-enhancing CT, and early and delayed enhanced CT using the region of interest. We used ROC curves to determine the specificity and sensitivity of non-enhanced CT scans and the washout rate according to the various cut-off for adrenal adenomas. RESULTS We divided the patients into adrenal adenoma group (n = 138) and non-adrenal adenoma group (n = 106) based on final pathologic report. Using the unenhanced images with a threshold of 10 HU, the sensitivity was 45.7 %, and the specificity was 97.1 %. Using the 15-min-washout rate with a threshold of 55 %, the sensitivity was 93.9 %, and the specificity was 95.8 %. CONCLUSIONS Regardless of various CT machines and protocols, a washout rate of 15-min-delayed CT was most useful in the diagnosis of adrenal adenomas due to the early inflow and outflow of contrast media in the tissues of adrenal adenomas.
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41
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Bittner JG, Brunt LM. Evaluation and management of adrenal incidentaloma. J Surg Oncol 2012; 106:557-64. [PMID: 22623268 DOI: 10.1002/jso.23161] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 04/29/2012] [Indexed: 12/14/2022]
Abstract
Adrenal incidentaloma is the most common adrenal neoplasm encountered in clinical practice. The timely, accurate, and cost-effective evaluation and management of adrenal lesions found incidentally can be challenging for clinicians. Evaluation begins with biochemical screening and additional imaging. Management strategies vary by patient factors and tumor characteristics. Adrenalectomy is indicated for lesions that are hormonally active, larger than 4-5 cm, symptom-related, and have an imaging appearance that is atypical of a benign lesion.
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Affiliation(s)
- James G Bittner
- Section of Minimally Invasive Surgery, Department of Surgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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Abstract
Adenoma, myelolipoma, phaeochromocytoma, metastases, adrenocortical carcinoma, neuroblastoma, and lymphoma account for the majority of adrenal neoplasms that are encountered in clinical practice. A variety of imaging methods are available for evaluating adrenal lesions including ultrasound, computed tomography (CT), magnetic resonance imaging (MRI), and nuclear medicine techniques such as meta-iodobenzylguanidine (MIBG) scintigraphy and positron-emission tomography (PET). Lipid-sensitive imaging techniques such as unenhanced CT and chemical shift MRI enable detection and characterization of lipid-rich adenomas based on an unenhanced CT attenuation of ≤ 10 HU and signal loss on opposed-phase compared to in-phase T1-weighted images, respectively. In indeterminate cases, an adrenal CT washout study may differentiate adenomas (both lipid-rich and lipid-poor) from other adrenal neoplasms based on an absolute percentage washout of >60% and/or a relative percentage washout of >40%. This is based on the principle that adenomas show rapid contrast washout while most other adrenal neoplasms including malignant tumours show slow contrast washout instead. ¹⁸F-2-fluoro-2-deoxy-d-glucose-PET (¹⁸FDG-PET) imaging may differentiate benign from malignant adrenal neoplasms by demonstrating high tracer uptake in malignant neoplasms based on the increased glucose utilization and metabolic activity found in most of these malignancies. In this review, the multi-modality imaging appearances of adrenal neoplasms are discussed and illustrated. Key imaging findings that facilitate lesion characterization and differentiation are emphasized. Awareness of these imaging findings is essential for improving diagnostic confidence and for reducing misinterpretation errors.
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Liu QY, Gao M, Li HG, Lin XF, Huang SQ, Liang BL. Juxta-adrenal schwannoma: Dynamic multi-slice CT and MRI findings. Eur J Radiol 2012; 81:794-9. [DOI: 10.1016/j.ejrad.2011.01.082] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 01/20/2011] [Indexed: 11/27/2022]
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Oliveira Caiafa R, Salvador Izquierdo R, Buñesch Villalba L, Sebastià Cerqueda M, Nicolau Molina C. Diagnosis and management of adrenal incidentaloma. RADIOLOGIA 2011. [DOI: 10.1016/j.rxeng.2011.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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45
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Oliveira Caiafa R, Salvador Izquierdo R, Buñesch Villalba L, Sebastià Cerqueda MC, Nicolau Molina C. [Diagnosis and management of adrenal incidentaloma]. RADIOLOGIA 2011; 53:516-30. [PMID: 21944711 DOI: 10.1016/j.rx.2011.06.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Revised: 06/01/2011] [Accepted: 06/15/2011] [Indexed: 12/17/2022]
Abstract
The growing demand for imaging tests and the progressive aging of the population have led to a progressive increase in the detection of indeterminate adrenal lesions. Once an adrenal incidentaloma is detected, clinical and hormone tests together with a battery of imaging techniques (CT, MRI, PET/CT…) make it possible to determine the cause in most cases. In this article, we discuss the advantages and limitations of each technique. We show the imaging characteristics of the most common adrenal lesions and propose a diagnostic algorithm to enable their diagnosis.
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Affiliation(s)
- R Oliveira Caiafa
- Centro de Diagnóstico por la Imagen, Hospital Clínic, Barcelona, España.
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46
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Harrison B. The indeterminate adrenal mass. Langenbecks Arch Surg 2011; 397:147-54. [DOI: 10.1007/s00423-011-0845-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Accepted: 08/29/2011] [Indexed: 12/25/2022]
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47
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Liang W. Preferred Diagnostic Tools for the Evaluation of Adrenal Masses: CT and MR Imaging. Radiology 2011; 260:610; author reply 610-1. [DOI: 10.1148/radiol.11110714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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48
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[Diagnostic efficacy and discriminatory capacity of positron emission tomography combined with axial tomography of adrenal lesions]. Cir Esp 2011; 88:247-52. [PMID: 20825935 DOI: 10.1016/j.ciresp.2010.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2009] [Revised: 05/29/2010] [Accepted: 07/19/2010] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The usefulness of 18fluorodeoxyglucose positron emission tomography combined with axial tomography (PET-CT) in diagnosing whether adrenal tumours are benign or malignant is assessed. MATERIAL AND METHODS A retrospective study conducted between June 2005 and May 2009 on a consecutive series of patients on whom a PET-CT scan was performed to study suspected malignant adrenal disease. Focal uptakes were assessed, along with the maximum standard uptake value (SUV), and the ratio of the maximum adrenal/hepatic value. The sensitivity, specificity, positive and negative predictive value of the test, the maximum adrenal uptake values and the ratio for those where the diagnostic yield was maximum. RESULTS Fifteen patients were included. The final diagnosis showed malignancy in eight and seven were benign. Ten patients had adrenal uptake: three in benign lesions and seven in neoplasias, with a mean uptake value of 6.3 (3.2 in benign lesions and 9.0 in malignant lesions). The mean adrenal/hepatic ratio was 1.8 (0.9 in benign and 2.6 in malignant lesions). When the presence of adrenal uptake is associated with a final diagnosis of malignancy, we obtained a sensitivity of 87.5%, a specificity of 57.1%, and a positive and negative predictive value of 70% and 80%, respectively. An SUV cut-off value of 6, or an adrenal/hepatic uptake ratio of 2, gave a sensitivity of 75%, a specificity of 100%, and a positive and negative predictive value of 100% and 77.7%, respectively. CONCLUSIONS PET-CT has a high ability to discriminate between benign and malignant lesions in the adrenal disease studied.
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Schuurbiers OCJ, Tournoy KG, Schoppers HJ, Dijkman BG, Timmers HJLM, de Geus-Oei LF, Grefte JMM, Rabe KF, Dekhuijzen PNR, van der Heijden HFM, Annema JT. EUS-FNA for the detection of left adrenal metastasis in patients with lung cancer. Lung Cancer 2011; 73:310-5. [PMID: 21277038 DOI: 10.1016/j.lungcan.2010.12.019] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 12/03/2010] [Accepted: 12/18/2010] [Indexed: 12/25/2022]
Abstract
In patients with lung cancer, enlarged or (18)Fluoro-deoxyglucose positron emission tomography ((18)FDG-PET) positive left adrenal glands are suspected for distant metastases and require tissue confirmation for a definitive assessment. The aim of this study was to assess the sensitivity of endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) for left adrenal metastases in lung cancer patients with a suspect adrenal gland based on imaging. EUS-FNA findings of patients with (suspected) lung cancer and CT enlarged or (18)FDG-PET positive left adrenal glands were retrospectively evaluated. In the absence of metastases at EUS, clinical and radiological follow-up was obtained. In 85 patients, EUS-FNA demonstrated left adrenal metastases of lung cancer in 53 (62%), benign adrenal tissue in 25 (29%), a metastasis from colon carcinoma in 1 (1%) and a primary adrenocortical carcinoma in 1 (1%) patient. In five patients (5.9%), the aspirates contained non-representative material. EUS outcomes were false negative in two patients. Sensitivity and negative predictive value (NPV) for EUS-FNA of the left adrenal gland were at least 86% (95% CI 74-93%) and 70% (95% CI 50-85%). No complications occurred. EUS-FNA is a sensitive, safe and minimally invasive technique to provide tissue proof of left adrenal metastases in patients with (suspected) lung cancer and enlarged or (18)FDG-PET positive adrenal glands. Therefore, EUS-FNA qualifies as the staging test of choice for patients with lung cancer with suspected left adrenal metastases.
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Affiliation(s)
- Olga C J Schuurbiers
- Department of Pulmonology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Magnetic resonance characterization of pheochromocytomas in the abdomen and pelvis: imaging findings in 18 surgically proven cases. J Comput Assist Tomogr 2010; 34:548-53. [PMID: 20657223 DOI: 10.1097/rct.0b013e3181d529f2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE To study the magnetic resonance imaging characteristics of adrenal and extra-adrenal pheochromocytomas in the abdomen and pelvis. METHODS We retrospectively reviewed 18 cases of pathologically proven cases of pheochromocytomas in the abdomen and pelvis. These patients have undergone magnetic resonance imaging evaluation before surgery. The study population included 10 men and 7 women (age range, 19-68 years; mean, 38 years). A consensus review of the magnetic resonance images was performed by 2 blinded expert observers. A qualitative evaluation was completed, and the tumors were classified by anatomical location, shape, T2 signal, contrast enhancement, and signal dropout on chemical shift pulse sequences. RESULTS On T2-weighted images, most lesions demonstrated mild to moderate increased signal intensity (SI) (n = 12), 5 lesions demonstrated a markedly increased SI, and only 1 lesion demonstrated an isointense SI on T2-weighted images.Five lesions demonstrated marked postcontrast enhancement. Three lesions demonstrated moderate enhancement, and 5 lesions demonstrated mild postcontrast enhancement.The pattern of enhancement was variable: 4 salt and pepper, 4 homogeneous, 3 heterogeneous, and 2 target with central necrosis and hemorrhage. None of the lesions contained significant amount of intracellular lipid, as no lesions demonstrated greater than 16.5% signal dropout on out-of-phase compared with in-phase pulse sequences.
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