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Zhang D, Liang N, Sun H, Frattini F, Sui C, Yang M, Wang H, Dionigi G. Critically evaluated key points on hereditary medullary thyroid carcinoma. Front Endocrinol (Lausanne) 2024; 15:1412942. [PMID: 38919477 PMCID: PMC11197075 DOI: 10.3389/fendo.2024.1412942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Accepted: 05/20/2024] [Indexed: 06/27/2024] Open
Abstract
Medullary thyroid carcinoma (MTC) accounts for only 3% of all thyroid carcinomas: 75% as sporadic MTC (sMTC) and 25% as hereditary MTC (hMTC) in the context of multiple endocrine neoplasia type 2 (MEN2). Early diagnosis is possible by determining the tumour marker calcitonin (Ctn) when clarifying nodular goitre and by detecting the mutation in the proto-oncogene RET in the MEN2 families. If the Ctn level is only slightly elevated, up to 30 pg/ml in women and up to 60 pg/ml in men, follow-up checks are advisable. At higher levels, surgery should be considered; at a level of > 100 pg/ml, surgery is always advisable. The treatment of choice is total thyroidectomy, possibly with central lymphadenectomy. In the early stage, cure is possible with adequate surgery; in the late stage, treatment with tyrosine kinase inhibitors is an option. RET A mutation analysis should be performed on all patients with MTC. During follow-up, a biochemical distinction is made between: healed (Ctn not measurably low), biochemically incomplete (Ctn increased without tumour detection) and structural tumour detection (metastases on imaging). After MTC surgery, the following results should be available for classification in follow-up care: (i) histology, Ctn immunohistology if necessary, (ii) classification according to the pTNM scheme, (iii) the result of the RET analysis for categorisation into the hereditary or sporadic variant and (iiii) the postoperative Ctn value. Tumour progression is determined by assessing the Ctn doubling time and the RECIST criteria on imaging. In most cases, "active surveillance" is possible. In the case of progression and symptoms, the following applies: local (palliative surgery, radiotherapy) before systemic (tyrosine kinase inhibitors).
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MESH Headings
- Humans
- Thyroid Neoplasms/genetics
- Thyroid Neoplasms/diagnosis
- Thyroid Neoplasms/pathology
- Thyroid Neoplasms/therapy
- Proto-Oncogene Mas
- Carcinoma, Medullary/genetics
- Carcinoma, Medullary/congenital
- Carcinoma, Medullary/diagnosis
- Carcinoma, Medullary/pathology
- Carcinoma, Medullary/therapy
- Multiple Endocrine Neoplasia Type 2a/genetics
- Multiple Endocrine Neoplasia Type 2a/diagnosis
- Multiple Endocrine Neoplasia Type 2a/pathology
- Multiple Endocrine Neoplasia Type 2a/therapy
- Proto-Oncogene Proteins c-ret/genetics
- Thyroidectomy
- Mutation
- Calcitonin/metabolism
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- Carcinoma, Neuroendocrine/genetics
- Carcinoma, Neuroendocrine/diagnosis
- Carcinoma, Neuroendocrine/pathology
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Affiliation(s)
- Daqi Zhang
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Nan Liang
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Hui Sun
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Francesco Frattini
- Division of Surgery, Istituto Auxologico Italiano IRCCS (Istituto di Ricovero e Cura a Carattere Scientifco), Milan, Italy
| | - Chengqiu Sui
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Mingyu Yang
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Hongbo Wang
- Division of Thyroid Surgery, The China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Gianlorenzo Dionigi
- Division of Surgery, Istituto Auxologico Italiano IRCCS (Istituto di Ricovero e Cura a Carattere Scientifco), Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
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Zhang D, Yang M, Frattini F, Cestari A, Li K, Wang H, Chi H, Sui C, Bai K, Lan D, Dionigi G, Sun H. Measuring discrepancies between simple medullary and synchronous medullary/papillary thyroid carcinomas: a comparative cross-sectional study. Front Endocrinol (Lausanne) 2024; 14:1301200. [PMID: 38317715 PMCID: PMC10841576 DOI: 10.3389/fendo.2023.1301200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 12/04/2023] [Indexed: 02/07/2024] Open
Abstract
Objective To study the clinicopathological characteristics of patients with synchronous medullary and papillary thyroid carcinomas. Methods The clinical data of patients with medullary thyroid carcinoma (MTC) operated in our hospital (Department of Thyroid Surgery, China-Japan Union Hospital, Jilin University) from February 2009 to February 2023 were evaluated using an analytical review approach. They were divided into an observation group (patients with synchronous MTC and papillary thyroid carcinoma PTC) and a control group (simple MTC) according to whether the clinical data were associated with MTC, in order to compare the clinical features, pathological types, stage characteristics and molecular biology characteristics of the two groups and to investigate the follow-up of the two groups. Results The study included 122 MTC, 30 with synchronous MTC/PTC and 92 simple MTC. When the data were compared, the sex ratio, preoperative calcitonin level, preoperative CEA level, presence of calcifications in the MTC lesions, surgical methods, number of MTC lesions, presence of nodular goitre and presence of thyroiditis were higher in the observation group than in the control group. There was a significant difference between the groups when the MTC lesion diameter was ≤1cm in terms of preoperative CEA value (P<0.05); when the MTC lesion diameter was >1cm, there was a statistical difference between the two groups in terms of preoperative Ctn value (P<0.05). Type III was significantly different from the simple group, while type IV was more similar to the simple group. The preoperative serum Ctn value was positively correlated with maximum tumour diameter in both groups, although the correlation was stronger in the easy group. Preoperative CEA was positively correlated with maximum tumour diameter in both groups, with a stronger correlation in the combination group. Preoperative Ctn and CEA were positively correlated with lymph node metastasis in the simple group, whereas there was no apparent correlation with lymph node metastasis in the combination group. The cut-off value of preoperative serum Ctn for cervical lymph node metastases in the simple group was 39.2pg/ml and for lateral cervical lymph node metastases 195.5pg/ml. The cut-off value of preoperative serum Ctn for cervical lymph node metastases in the combination group was 60.79pg/ml and for lateral cervical lymph node metastases 152.6pg/ml. In the simple group, prognosis was significantly worse in the progression group (P<0.001), with no statistical difference between the remission and stable groups. In the combination group, the prognosis of the progression and stable groups was significantly worse than that of the remission group (P<0.001), with no statistical difference between the progression and stable groups. Conclusion In patients with synchronous medullary and papillary thyroid carcinomas, preoperative Ctn and CEA levels, calcifications, solitary lesions, combined goitre or thyroiditis differ significantly from simple MTC. Therefore, clinical management should pay attention to the above factors and early risk screening should be performed to improve prognosis as much as possible.
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Affiliation(s)
- Daqi Zhang
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Mingyu Yang
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Francesco Frattini
- Division of Surgery, Istituto Auxologico Italiano Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
| | - Andrea Cestari
- Division of Surgery, Istituto Auxologico Italiano Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
| | - Kunlin Li
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Hongbo Wang
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Hao Chi
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Chengqiu Sui
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Kecheng Bai
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Dongyuan Lan
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
| | - Gianlorenzo Dionigi
- Division of Surgery, Istituto Auxologico Italiano Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Hui Sun
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, Jilin, China
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Zhang D, Colombo C, Sun H, Kim HY, Pino A, De Leo S, Gazzano G, Persani L, Dionigi G, Fugazzola L. Unilateral Surgery for Medullary Thyroid Carcinoma: Seeking for Clinical Practice Guidelines. Front Endocrinol (Lausanne) 2022; 13:875875. [PMID: 35898450 PMCID: PMC9309363 DOI: 10.3389/fendo.2022.875875] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 06/15/2022] [Indexed: 11/21/2022] Open
Abstract
Optimized preoperative diagnostic tools with calcitonin tests, ultrasound features, functional imaging modalities, and genetic testing to detect hereditary forms have led to an increased rate of earlier diagnosis and surgery for medullary thyroid cancer (MTC). This helps to adapt the primary surgery to the tumor stage and avoid surgical overtreatment for localized tumor growth, i.e., deviating from the regularly recommended thyroidectomy with bilateral central lymph node dissection in favor of a limited unilateral approach. To limit primary surgical therapy, it is crucial that the MTC is clinically unifocal, sporadic, and confined to the thyroid, and that calcitonin levels indicate biochemical recovery after surgery. The main requirement for such a limited approach is the availability of frozen section studies that reliably indicate (i) R0 resection of the MTC, (ii) absence of infiltration of the organ capsule, (iii) lack of desmoplasia (i.e., evidence of the metastatic potential of the MTC), (iiii) absence of contralateral disease or precancerous lesions. Informed consent is mandatory from the patient, who has been fully informed of the advantages, disadvantages, and potential risks of not undergoing the "classic" surgical procedure. The aim of this article is to review the guidelines for the management of early-stage MTC.
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Affiliation(s)
- Daqi Zhang
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Engineering Laboratory of Thyroid Disease Prevention and Control, Changchun City, China
| | - Carla Colombo
- Division of Endocrine and Metabolic Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Auxologico Italiano, Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- *Correspondence: Carla Colombo, ; Hui Sun,
| | - Hui Sun
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Engineering Laboratory of Thyroid Disease Prevention and Control, Changchun City, China
- *Correspondence: Carla Colombo, ; Hui Sun,
| | - Hoon Yub Kim
- Korea University College of Medicine (KUMC) Thyroid Center, Department of Surgery, Korea University Hospital, Korea University College of Medicine, Seoul, South Korea
| | - Antonella Pino
- Division of Surgery, Istituto Auxologico Italiano INstituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
- Department of Human Pathology of Adulthood and Childhood, University of Messina, Messina, Italy
| | - Simone De Leo
- Division of Endocrine and Metabolic Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Auxologico Italiano, Milan, Italy
| | - Giacomo Gazzano
- Pathology Unit, Istituto Auxologico Italiano INstituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
| | - Luca Persani
- Division of Endocrine and Metabolic Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Auxologico Italiano, Milan, Italy
- Department of Medical Biotechnologies and Translational Medicine, University of Milan, Milan, Italy
| | - Gianlorenzo Dionigi
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Division of Surgery, Istituto Auxologico Italiano INstituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
| | - Laura Fugazzola
- Division of Endocrine and Metabolic Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Auxologico Italiano, Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
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Abu-Bonsrah KD, Newgreen DF, Dottori M. Development of Functional Thyroid C Cell-like Cells from Human Pluripotent Cells in 2D and in 3D Scaffolds. Cells 2021; 10:cells10112897. [PMID: 34831120 PMCID: PMC8616516 DOI: 10.3390/cells10112897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 11/19/2022] Open
Abstract
Medullary thyroid carcinoma contributes to about 3–4% of thyroid cancers and affects C cells rather than follicular cells. Thyroid C cell differentiation from human pluripotent stem cells has not been reported. We report the stepwise differentiation of human embryonic stem cells into thyroid C cell-like cells through definitive endoderm and anterior foregut endoderm and ultimobranchial body-like intermediates in monolayer and 3D Matrigel culture conditions. The protocol involved sequential treatment with interferon/transferrin/selenium/pyruvate, foetal bovine serum, and activin A, then IGF-1 (Insulin-like growth factor 1), on the basis of embryonic thyroid developmental sequence. As well as expressing C cell lineage relative to follicular-lineage markers by qPCR (quantitative polymerase chain reaction) and immunolabelling, these cells by ELISA (enzyme-linked immunoassay) exhibited functional properties in vitro of calcitonin storage and release of calcitonin on calcium challenge. This method will contribute to developmental studies of the human thyroid gland and facilitate in vitro modelling of medullary thyroid carcinoma and provide a valuable platform for drug screening.
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Affiliation(s)
- Kwaku Dad Abu-Bonsrah
- The Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC 3010, Australia
- Correspondence: (K.D.A.-B.); (D.F.N.); (M.D.)
| | - Donald F. Newgreen
- The Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC 3052, Australia
- Correspondence: (K.D.A.-B.); (D.F.N.); (M.D.)
| | - Mirella Dottori
- Department of Biomedical Engineering, Department of Anatomy and Neurosciences, University of Melbourne, Parkville, VIC 3010, Australia
- Illawarra Health and Medical Research Institute, School of Medicine, Molecular Horizons, University of Wollongong, Wollongong, NSW 2522, Australia
- Correspondence: (K.D.A.-B.); (D.F.N.); (M.D.)
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Ríos A, Rodríguez JM, Febrero B, Acosta JM, Torregrosa N, Balsalobre M, Parrilla P. Perfil histológico e inmuno-histoquímico del carcinoma medular de tiroides esporádico y familiar. ACTA ACUST UNITED AC 2011; 58:521-8. [DOI: 10.1016/j.endonu.2011.07.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 07/03/2011] [Accepted: 07/04/2011] [Indexed: 12/26/2022]
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Dionigi G, Duran-Poveda M. New approaches in thyroid surgery: is there an increased risk of nerve injury? Ann Surg Oncol 2011; 18 Suppl 3:S252-3. [PMID: 21717242 DOI: 10.1245/s10434-011-1869-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Indexed: 11/18/2022]
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Dionigi G. Evidence-based review series on endoscopic thyroidectomy: real progress and future trends. World J Surg 2009; 33:365-6. [PMID: 19034568 DOI: 10.1007/s00268-008-9834-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dionigi G, Rovera F, Boni L. Commentary on transoral access for endoscopic thyroid resection : Witzel K, von Rahden BH, Kaminski C, Stein HJ (2008) Transoral access for endoscopic thyroid resection. Surg Endosc 22(8):1871-1875. Surg Endosc 2008; 23:454-5; discussion 456. [PMID: 19067050 DOI: 10.1007/s00464-008-0241-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Accepted: 09/22/2008] [Indexed: 02/07/2023]
Affiliation(s)
- Gianlorenzo Dionigi
- Endocrine Surgery Research Center, Department of Surgical Sciences, University of Insubria, Via Guicciardini, Varese, 21100, Italy.
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Solitary intrathyroidal metastasis of renal clear cell carcinoma in a toxic substernal multinodular goiter. Thyroid Res 2008; 1:6. [PMID: 19014412 PMCID: PMC2596782 DOI: 10.1186/1756-6614-1-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Accepted: 10/24/2008] [Indexed: 01/21/2023] Open
Abstract
Introduction Thyroid gland is a rare site of clinically detectable tumor metastasis. Case report A 71-year-old woman was referred to our department for an evaluation of toxic multinodular substernal goiter. She had a history of renal clear cell carcinoma of the left kidney, which had been resected 2 years previously. US confirmed the multinodular goiter. Total thyroidectomy with neuromonitoring was performed on March 2008. A histological examination revealed a solitary metastasis of a clear cell renal cancer in a diffuse multinodular goiter. No distant metastases are detected. Conclusion Although uncommon, it is important for the endocrine surgeon and endocrine oncologist to be able to recognize and differentiate intrathyroid metastases from more primary common thyroid neoplasms. The diagnosis can be suspected if the patient has a thyroid tumor and a past history of extrathyroid cancer. These tumors, on the whole, tend to behave more aggressively and, in most cases, the use of multimodality therapy is recommended.
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Mechanick JI, Carpi A. Thyroid cancer: The impact of emerging technologies on clinical practice guidelines. Biomed Pharmacother 2008; 62:554-8. [DOI: 10.1016/j.biopha.2008.07.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2008] [Accepted: 07/01/2008] [Indexed: 01/21/2023] Open
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Use of a single bipolar electrode in the posterior arytenoids muscles for bilateral monitoring of the recurrent laryngeal nerves in thyroid surgery: standardization of the technique. Eur Arch Otorhinolaryngol 2008; 265:1431-2. [DOI: 10.1007/s00405-008-0787-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Accepted: 07/29/2008] [Indexed: 10/21/2022]
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