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Hwang SM, Park JE, Yoo SY, Kim JH, Baek SY, Moon SH, Jeon TY. Diffusion-Weighted MR Imaging of the Thymus in Children with Non-Thymic Neoplasms. Diagnostics (Basel) 2023; 13:3654. [PMID: 38132238 PMCID: PMC10742587 DOI: 10.3390/diagnostics13243654] [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: 10/27/2023] [Revised: 12/09/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023] Open
Abstract
Purpose: To investigate the diffusion-weighted imaging (DWI) findings and apparent diffusion coefficient (ADC) value of the thymus in children under the age of 13 who have non-thymic neoplasms. Materials and Methods: From January 2021 to April 2023, a single-center retrospective study analyzed consecutive 191 thoracic MRI scans with DWI from 67 children (<13 years) with non-thymic neoplasms. The scans were categorized based on the presence of restricted diffusion on DWI. We analyzed the demographics, laboratory data, and MR findings of the thymus. Statistical differences were assessed using generalized estimating equations. Results: Forty-five percent (86/191) of the scans exhibited restricted diffusion in the thymus: multifocal (n = 65; 76%), focal (n = 19; 22%), and diffuse (n = 2; 2%) patterns. The restricted diffusion group demonstrated higher absolute lymphocyte counts, more prominent thymus sizes, and higher frequency of off-treatment status compared to the unrestricted diffusion group (p>0.05). The mean ADC value across all 191 scans was 1.80 × 10-3 mm2/s. No significant difference was observed in the ADC value related to restricted diffusion patterns, the MRI vendors, or the age at the time of the scan. Conclusions: Restricted diffusion was observed in 45% of the thymus in children with non-thymic neoplasms, with a mean ADC value of 1.80 × 10-3 mm2/s. Recognizing the DWI findings can prevent unnecessary invasive procedures, alleviating concerns for patients and families.
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Affiliation(s)
- Sook Min Hwang
- Department of Radiology, Hallym University Kangnam Sacred Heart Hospital, Seoul 07441, Republic of Korea
| | - Ji Eun Park
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea; (J.E.P.)
| | - So-Young Yoo
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea; (J.E.P.)
| | - Ji Hye Kim
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea; (J.E.P.)
| | - Sun-Young Baek
- Biomedical Statistics Center and Research Institute for Future Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea
| | - Sung-Hoon Moon
- Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang 14068, Republic of Korea
| | - Tae Yeon Jeon
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea; (J.E.P.)
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Ahuja J, Strange CD, Agrawal R, Erasmus LT, Truong MT. Approach to Imaging of Mediastinal Masses. Diagnostics (Basel) 2023; 13:3171. [PMID: 37891992 PMCID: PMC10606219 DOI: 10.3390/diagnostics13203171] [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: 09/08/2023] [Revised: 10/04/2023] [Accepted: 10/07/2023] [Indexed: 10/29/2023] Open
Abstract
Mediastinal masses present a diagnostic challenge due to their diverse etiologies. Accurate localization and internal characteristics of the mass are the two most important factors to narrow the differential diagnosis or provide a specific diagnosis. The International Thymic Malignancy Interest Group (ITMIG) classification is the standard classification system used to localize mediastinal masses. Computed tomography (CT) and magnetic resonance imaging (MRI) are the two most commonly used imaging modalities for characterization of the mediastinal masses.
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Affiliation(s)
- Jitesh Ahuja
- Department of Thoracic Imaging, The University of Texas MD Andeson Cancer Center, Houston, TX 77030, USA; (C.D.S.); (R.A.); (M.T.T.)
| | - Chad D. Strange
- Department of Thoracic Imaging, The University of Texas MD Andeson Cancer Center, Houston, TX 77030, USA; (C.D.S.); (R.A.); (M.T.T.)
| | - Rishi Agrawal
- Department of Thoracic Imaging, The University of Texas MD Andeson Cancer Center, Houston, TX 77030, USA; (C.D.S.); (R.A.); (M.T.T.)
| | - Lauren T. Erasmus
- Department of Anatomy and Cell Biology, Faculty of Sciences, McGill University, Montreal, QC H3A 0G4, Canada;
| | - Mylene T. Truong
- Department of Thoracic Imaging, The University of Texas MD Andeson Cancer Center, Houston, TX 77030, USA; (C.D.S.); (R.A.); (M.T.T.)
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Sabri YY, Ewis NM, Zawam HEH, Khairy MA. Role of diffusion MRI in diagnosis of mediastinal lymphoma: initial assessment and response to therapy. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2021. [DOI: 10.1186/s43055-021-00597-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Abstract
Background
Malignant lymphoma accounts for nearly 20% of all mediastinal neoplasms in adults and 50% in children. Hodgkin’s disease is the most common primary mediastinal lymphoma. In non-Hodgkin’s lymphoma, the two most common forms of primary mediastinal lymphoma are lymphoblastic lymphoma and diffuse large B-cell lymphoma. The aim of this study is to implement diffusion MRI in the algorithm of diagnosis of mediastinal lymphoma, differentiating Hodgkin's from non-Hodgkin's lymphoma and assessment of post therapeutic response.
Results
Using Diffusion weighted magnetic resonance imaging DWI-MRI, there were statistic significant difference between ADC values in lymph nodes and mediastinal masses in Hodgkin and non-Hodgkin lymphomas. ADC range in non-treated Hodgkin lymphoma cases was 0.774 to 1.4, while ADC range in in non-treated non-Hodgkin lymphoma was 0.476 to 0.668. In this study, there was statistically significant difference of ADC values in lymphoma cases presented by mediastinal masses with and without chemotherapy.
Conclusions
Diffusion weighted magnetic resonance imaging DWI-MRI is a promising functional technique in diagnosis of Hodgkin's and non-Hodgkin's lymphoma and assessment of response to treatment with no need for special preparation, contrast injection or radiation exposure.
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Garrana SH, Rosado-de-Christenson ML. Imaging of the Anterior/Prevascular Mediastinum. Radiol Clin North Am 2021; 59:155-168. [PMID: 33551078 DOI: 10.1016/j.rcl.2020.10.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Prevascular mediastinal masses include a wide range of benign and malignant entities. Localization of mediastinal masses to specific compartments together with characteristic imaging findings and demographic and clinical information allows formulation of a focused differential diagnosis. Radiologists may use these methods to distinguish between surgical and nonsurgical cases and thus inform patient management and have an impact on outcomes. Treatment of choice varies based on the pathology, ranging from no intervention or serial imaging follow-up to surgical excision, chemotherapy, and/or radiation.
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Affiliation(s)
- Sherief H Garrana
- Department of Radiology, Saint Luke's Hospital of Kansas City, 4401 Wornall Road, Kansas City, MO 64111, USA; University of Missouri-Kansas City School of Medicine, 2411 Holmes Street, Kansas City, MO 64108, USA.
| | - Melissa L Rosado-de-Christenson
- Department of Radiology, Saint Luke's Hospital of Kansas City, 4401 Wornall Road, Kansas City, MO 64111, USA; University of Missouri-Kansas City School of Medicine, 2411 Holmes Street, Kansas City, MO 64108, USA
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5
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Hyperdense Thymic Atrophy After Chemotherapy in Pediatric Patients With Extrathoracic Malignancies. J Comput Assist Tomogr 2020; 44:865-869. [PMID: 32976257 DOI: 10.1097/rct.0000000000001101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The aim of the study was to evaluate computed tomography (CT) imaging findings of hyperdense thymic atrophy after chemotherapy in pediatric patients with extrathoracic malignancies. METHODS Seventy-eight pediatric patients with extrathoracic malignancies, who developed thymic atrophy after chemotherapy, were included in this study. All patients underwent CT imaging before and after chemotherapy. We retrospectively reviewed the CT images. Hyperdense thymic atrophy was defined as thymic atrophy with high CT attenuation (≥80 HU). RESULTS Hyperdense thymic atrophy after chemotherapy was observed in 7 (9%) of 78 patients. Age (4.3 ± 2.4 vs 8.4 ± 5.4 years, P < 0.01), thymic CT attenuation before chemotherapy (70.4 ± 18.8 vs 55.2 ± 11.9 HU, P < 0.01), reduction rate in thymic area (0.76 ± 0.06 vs 0.60 ± 0.22, P < 0.01), and thymic CT attenuation change (30.3 ± 15.2 vs -16.8 ± 24.0 HU, P < 0.01) were significantly different between patients with and without hyperdense thymic atrophy after chemotherapy. Thymic CT attenuation after chemotherapy (61.2 ± 23.8 vs 33.8 ± 30.1 HU, P < 0.01) and thymic CT attenuation change (-1.3 ± 21.2 vs -19.3 ± 27.9 HU, P < 0.01) were significantly different between patients 5 years or younger (n = 29) and 6 years or older (n = 49). CONCLUSIONS Hyperdense thymic atrophy after chemotherapy was observed in 9% of pediatric patients with extrathoracic malignancies. It was associated with younger age, greater thymic CT attenuation before chemotherapy, larger reduction rate in thymic area, and greater thymic CT attenuation change.
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Tuan PA, Vien MV, Dong HV, Sibell D, Giang BV. The Value of CT and MRI for Determining Thymoma in Patients With Myasthenia Gravis. Cancer Control 2019; 26:1073274819865281. [PMID: 31331197 PMCID: PMC6651671 DOI: 10.1177/1073274819865281] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The aim of the study was to evaluate the usefulness of computed tomography (CT) and magnetic resonance imaging (MRI) for differentiating thymoma from nonthymoma abnormalities in patients with myasthenia gravis (MG). A cross-sectional study of 53 patients with MG, who had undergone surgical thymectomy, was conducted at 103 Hospital (Hanoi, Vietnam) and Cho Ray Hospital (Ho Chi Minh City, Vietnam) during August 2014 and January 2017. The CT and MRI images of patients with MG were qualitatively and quantitatively (radiodensity and chemical shift ratio [CSR]) analyzed to determine and compare their ability to distinguish thymoma from nonthymoma abnormalities. Logistic regression was used to identify the association between imaging parameters (eg, CSR) and the thymoma status. The receiver operating curve (ROC) analysis was used to determine the differentiating ability of CSR and radiodensity. As results, of the 53 patients with MG, 33 were with thymoma and 20 were with nonthymoma abnormalities. At qualitative assessment, MRI had significantly higher accuracy than did CT in differentiating thymoma from nonthymoma abnormalities (94.3% vs 83%). At quantitative assessment, both the radiodensity and CSR were significantly higher for thymoma compared with nonthymoma groups (P < .001). The ROC analysis showed that CSR had significantly higher sensitivity (Se) and specificity (Sp) than radiodensity in discriminating between the 2 groups (CSR: Se 100%, Sp 95% vs radiodensity: Se 90.9%, Sp 70%). When combining both qualitative and quantitative parameters, MRI had even higher accuracy than did CT in thymoma diagnosis (P = .031). In conclusion, chemical shift MRI was more accurate than CT for differentiating thymoma from nonthymoma in patients with MG.
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Affiliation(s)
| | | | | | - David Sibell
- 3 Oregon Health & Science University, Portland, OR, USA
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Priola AM, Gned D, Veltri A, Priola SM. Case 261: Thymoma Embedded in Thymus with Pleural Implant in Myasthenia Gravis Lambert-Eaton Overlap Syndrome. Radiology 2018; 290:264-269. [PMID: 30571477 DOI: 10.1148/radiol.2018161761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
History A 29-year-old woman presented with a 6-month history of progressive general fatigue, fluctuating limb weakness, and difficulty climbing stairs. She initially experienced occasional episodes of transient diplopia that developed while reading in the evening. She subsequently started to experience dry eyes and mouth, difficulty chewing, and mild dysphagia that worsened throughout the day. Her medical history included hypothyroidism from Hashimoto thyroiditis and pneumonia with left pleural effusion. She had no smoking history, and her body mass index was normal (23.8 kg/m2). No medication use was reported at admission. Physical examination revealed mild bilateral ptosis, reduced muscle tone and strength that worsened in proximal leg muscles, and decreased deep tendon reflexes. An edrophonium test revealed improvement in muscle strength and eyelid ptosis. Repetitive nerve stimulation revealed low amplitude of compound muscle action potential at rest (0.21 mV), with a marked increase (700%; normal increase, <60%) at high-rate stimulation (50 Hz). Laboratory work-up was unremarkable except for detection of acetylcholine receptor antibodies in the serum (21.30 nmol/L) and P/Q-type voltage-gated calcium channel antibodies (220 pmol/L). Recent MRI of the brain and spine at an outside hospital showed no abnormal findings. At admission, the patient underwent CT of the chest, abdomen, and pelvis followed by thoracic MRI to further evaluate CT findings.
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Affiliation(s)
- Adriano M Priola
- From the Department of Diagnostic Imaging, San Luigi Gonzaga Hospital, University of Torino, Regione Gonzole 10, Orbassano 10043 (Torino), Italy
| | - Dario Gned
- From the Department of Diagnostic Imaging, San Luigi Gonzaga Hospital, University of Torino, Regione Gonzole 10, Orbassano 10043 (Torino), Italy
| | - Andrea Veltri
- From the Department of Diagnostic Imaging, San Luigi Gonzaga Hospital, University of Torino, Regione Gonzole 10, Orbassano 10043 (Torino), Italy
| | - Sandro M Priola
- From the Department of Diagnostic Imaging, San Luigi Gonzaga Hospital, University of Torino, Regione Gonzole 10, Orbassano 10043 (Torino), Italy
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Xie Y, Zhang S, Liu J, Liang X, Zhang X, Zhang Y, Zhang Z, Zhou J. Value of CT spectral imaging in the differential diagnosis of thymoma and mediastinal lymphoma. Br J Radiol 2018; 92:20180598. [PMID: 30507309 PMCID: PMC6541195 DOI: 10.1259/bjr.20180598] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Objective: To investigate the imaging characteristics of thymoma and mediastinal
lymphoma using spectral CT and evaluate whether the quantitative information
can improve the differential diagnosis of these diseases. Methods: This retrospective study was approved by the institutional review board, and
written informed consent was obtained from all patients. Overall, 39
patients with mediastinal tumors (24 thymomas and 15 mediastinal lymphomas)
were examined with CT spectral imaging during the arterial phase (AP) and
venous phase (VP). Iodine concentrations were derived from iodine-based
material-decomposition CT images and normalized to the iodine concentration
in the aorta. The difference in normalized iodine concentrations (NICs), HU
curve slop(λHU), and the differences between AP and VP for
CT values of lesions in 70 Kev were calculated. The two-sample
t-test was performed to compare quantitative
parameters, and non-quantitative parameters were compared with the
Chi-square test (Fisher exact). Receiver operating characteristic (ROC)
curves were generated to help establish threshold values for the parameters
required for the significant differentiation of thymomas from mediastinal
lymphomas. Two readers qualitatively assessed the lesion types according to
the imaging features. The sensitivity and specificity of the qualitative and
quantitative studies were compared. Results: NICs during the VP and λHU during the AP in patients with
mediastinal lymphomas differed significantly from those in patients with
thymomas. The mean NICs during the VP were 0.28 ± 0.08
mg ml−1 (±standard deviation)
vs 0.49 ± 0.15
mg ml−1, respectively. The
λHU during the AP was 0.69 ± 0.17
vs 1.26 ± 0.74, respectively. The NICs during the
VP and λHU during the AP had high sensitivity and
specificity in differentiating mediastinal lymphomas from thymomas. The
tumor location, margin, necrosis, presence of swollen mediastinal lymph
nodes, relationship with adjacent vessels, and enhancement pattern differed
significantly between the groups (p < 0.05). The
combination of NICs and λHU had higher sensitivity and
specificity than did those of conventional qualitative CT image analysis
during the combined phases. Conclusion: CT spectral imaging has promising potential for the diagnostic
differentiation of mediastinal lymphomas and thymomas. The iodine content
and λHU could be valuable parameters for differentiating
thymomas and mediastinal lymphomas. Advances in knowledge: The iodine content and λHU, provided by spectral CT, could
be used as new parameters to distinguish mediastinal lymphomas from
thymomas.
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Affiliation(s)
- Yijing Xie
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
| | - Shipeng Zhang
- 2 Department of Radiology, Gansu Provincial Maternity and Child-care hospital , Lanzhou , PR China
| | - Jianli Liu
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
| | - Xiaohong Liang
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
| | - Xueling Zhang
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
| | - Yuting Zhang
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
| | - Zhuoli Zhang
- 3 Department of Radiology, Northwestern University , Chicago , USA
| | - Junlin Zhou
- 1 Department of Radiology, Lanzhou University Second Hospital , Lanzhou , PR China
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Priola AM, Priola SM, Gned D, Giraudo MT, Veltri A. Nonsuppressing normal thymus on chemical-shift MR imaging and anterior mediastinal lymphoma: differentiation with diffusion-weighted MR imaging by using the apparent diffusion coefficient. Eur Radiol 2017; 28:1427-1437. [PMID: 29143106 DOI: 10.1007/s00330-017-5142-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 09/14/2017] [Accepted: 10/18/2017] [Indexed: 12/22/2022]
Abstract
OBJECTIVES To prospectively evaluate usefulness of the apparent diffusion coefficient (ADC) in differentiating anterior mediastinal lymphoma from nonsuppressing normal thymus on chemical-shift MR, and to look at the relationship between patient age and ADC. METHODS Seventy-three young subjects (25 men, 48 women; age range, 9-29 years), who underwent chemical-shift MR and diffusion-weighted MR were divided into a normal thymus group (group A, 40 subjects), and a lymphoma group (group B, 33 patients). For group A, all subjects had normal thymus with no suppression on opposed-phase chemical-shift MR. Two readers measured the signal intensity index (SII) and ADC. Differences in SII and ADC between groups were tested using t-test. ADC was correlated with age using Pearson correlation coefficient. RESULTS Mean SII±standard deviation was 2.7±1.8% for group A and 2.2±2.4% for group B, with no significant difference between groups (P=.270). Mean ADC was 2.48±0.38x10-3mm2/s for group A and 1.24±0.23x10-3mm2/s for group B. A significant difference between groups was found (P<.001), with no overlap in range. Lastly, significant correlation was found between age and ADC (r=0.935, P<.001) in group A. CONCLUSIONS ADC of diffusion-weighted MR is a noninvasive and accurate parameter for differentiating lymphoma from nonsuppressing thymus on chemical-shift MR in young subjects. KEY POINTS • SII cannot differentiate mediastinal lymphoma from nonsuppressing normal thymus at visual assessment • ADC is useful for distinguishing nonsuppressing normal thymus from mediastinal lymphoma • ADC is more accurate than transverse-diameter and surface-area in this discrimination • ADC of normal thymus is age dependent and increases with increasing age.
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Affiliation(s)
- Adriano Massimiliano Priola
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Regione Gonzole 10, 10043, Orbassano, Torino, Italy.
| | - Sandro Massimo Priola
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Regione Gonzole 10, 10043, Orbassano, Torino, Italy
| | - Dario Gned
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Regione Gonzole 10, 10043, Orbassano, Torino, Italy
| | - Maria Teresa Giraudo
- Department of Mathematics, "Giuseppe Peano", University of Torino, Via Carlo Alberto 10, 10123, Torino, Italy
| | - Andrea Veltri
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Regione Gonzole 10, 10043, Orbassano, Torino, Italy
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Priola AM, Priola SM, Gned D, Giraudo MT, Brundu M, Righi L, Veltri A. Diffusion-weighted quantitative MRI of pleural abnormalities: Intra- and interobserver variability in the apparent diffusion coefficient measurements. J Magn Reson Imaging 2017; 46:769-782. [PMID: 28117923 DOI: 10.1002/jmri.25633] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 12/28/2016] [Indexed: 12/14/2022] Open
Abstract
PURPOSE To assess intra- and interobserver variability in the apparent diffusion coefficient (ADC) measurements of pleural abnormalities. MATERIALS AND METHODS Diffusion-weighted magnetic resonance imaging was performed in 34 patients to characterize pleural abnormalities, with a 1.5T unit at b values of 0/150/500/800 sec/mm2 . In two sessions held 3 months apart, on perfusion-free ADC maps, two independent readers measured the ADC of pleural abnormalities (two readings for each reader in each case) using different methods of region-of-interest (ROI) positioning. In three methods, freehand ROIs were drawn within tumor boundaries to encompass the entire lesion on one or more axial slices (whole tumor volume [WTV], three slices observer-defined [TSOD], single-slice [SS]), while in two methods one or more ROIs were placed on the more restricted areas (multiple small round ROI [MSR], one small round ROI [OSR]). Measurement variability between readings by each reader (intraobserver repeatability) and between readers in first reading (interobserver repeatability) were assessed using intraclass correlation coefficient (ICC) and coefficient of variation (CoV). Analysis of variance (ANOVA) was performed to compare ADC values between the different methods. The measurement time of each case for all methods in first reading was recorded and compared between methods and readers. RESULTS All methods demonstrated good (MSR, OSR) and excellent (WTV, TSOD, SS) intra- and interreader agreement, with best and worst repeatability in WTV (lower ICC, 0.977; higher CoV, 3.5%) and OSR (lower ICC, 0.625; higher CoV, 22.8%), respectively. The lower 95% confidence interval of ICC resulted in fair to moderate agreement for OSR (up to 0.379) and in excellent agreement for WTV, TSV, and SS (up to 0.918). ADC values of OSR and MSR were significantly lower compared to other methods (P < 0.001). The OSR and SS required less measurement time (10 and 21/22 sec, respectively) compared to the others (P < 0.0001), while the WTV required the longest measurement time (132/134 sec) (P < 0.0001). CONCLUSION ADC measurements of pleural abnormalities are repeatable. The SS method has excellent repeatability, similar to WTV, but requires significantly less measurement time. Thus, its use should be preferred in clinical practice. LEVEL OF EVIDENCE 4 Technical Efficacy: Stage 2 J. MAGN. RESON. IMAGING 2017;46:769-782.
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Affiliation(s)
| | - Sandro Massimo Priola
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Orbassano (Torino), Italy
| | - Dario Gned
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Orbassano (Torino), Italy
| | | | - Maria Brundu
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Orbassano (Torino), Italy
| | - Luisella Righi
- Department of Pathology, San Luigi Gonzaga University Hospital, Orbassano (Torino), Italy
| | - Andrea Veltri
- Department of Diagnostic Imaging, San Luigi Gonzaga University Hospital, Orbassano (Torino), Italy
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Priola AM, Priola SM, Gned D, Piacibello E, Sardo D, Parvis G, Torti D, Ardissone F, Veltri A. Diffusion-weighted quantitative MRI to diagnose benign conditions from malignancies of the anterior mediastinum: Improvement of diagnostic accuracy by comparing perfusion-free to perfusion-sensitive measurements of the apparent diffusion coefficient. J Magn Reson Imaging 2016; 44:758-769. [DOI: 10.1002/jmri.25203] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
Affiliation(s)
| | - Sandro Massimo Priola
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Dario Gned
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Edoardo Piacibello
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Diego Sardo
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Guido Parvis
- Department of Internal Medicine and Hematology; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Davide Torti
- Department of Internal Medicine and Hematology; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Francesco Ardissone
- Department of Thoracic Surgery; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Andrea Veltri
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
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Apparent diffusion coefficient measurements in diffusion-weighted magnetic resonance imaging of the anterior mediastinum: inter-observer reproducibility of five different methods of region-of-interest positioning. Eur Radiol 2016; 27:1386-1394. [DOI: 10.1007/s00330-016-4527-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 05/23/2016] [Accepted: 07/21/2016] [Indexed: 12/12/2022]
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Comparison of CT and chemical-shift MRI for differentiating thymoma from non-thymomatous conditions in myasthenia gravis: value of qualitative and quantitative assessment. Clin Radiol 2016; 71:e157-69. [DOI: 10.1016/j.crad.2015.12.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 11/03/2015] [Accepted: 12/14/2015] [Indexed: 11/22/2022]
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14
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Priola AM, Veltri A, Priola SM. Importance of different region-of-interest protocols for the apparent diffusion coefficient measurement of tumors in diffusion-weighted magnetic resonance imaging. J Magn Reson Imaging 2016; 44:1056. [DOI: 10.1002/jmri.25190] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 01/25/2016] [Indexed: 12/12/2022] Open
Affiliation(s)
| | - Andrea Veltri
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
| | - Sandro Massimo Priola
- Department of Diagnostic Imaging; San Luigi Gonzaga University Hospital; Orbassano (Torino) Italy
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Priola AM, Gned D, Veltri A, Priola SM. Chemical shift and diffusion-weighted magnetic resonance imaging of the anterior mediastinum in oncology: Current clinical applications in qualitative and quantitative assessment. Crit Rev Oncol Hematol 2016; 98:335-57. [DOI: 10.1016/j.critrevonc.2015.11.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 10/04/2015] [Accepted: 11/19/2015] [Indexed: 12/15/2022] Open
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Diffusion-weighted magnetic resonance imaging of thymoma: ability of the Apparent Diffusion Coefficient in predicting the World Health Organization (WHO) classification and the Masaoka-Koga staging system and its prognostic significance on disease-free survival. Eur Radiol 2015; 26:2126-38. [DOI: 10.1007/s00330-015-4031-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/15/2015] [Indexed: 01/22/2023]
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17
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Chemical-Shift and Diffusion-Weighted Magnetic Resonance Imaging of Thymus in Myasthenia Gravis. Invest Radiol 2015; 50:228-38. [DOI: 10.1097/rli.0000000000000120] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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