Unique Case of a Large Indolent Medullary Thyroid Carcinoma: Time to Reconsider the Medullary Thyroid Adenoma Entity?

Simona Censi, Elisabetta Cavedon, Sara Watutantrige-Fernando, Susi Barollo, Loris Bertazza, Jacopo Manso, Maurizio Iacobone, Davide Nacamulli, Francesca Galuppini, Gianmaria Pennelli, Caterina Mian

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Medullary thyroid carcinoma (MTC) is a rare neuroendocrine cancer originating from parafollicular, calcitonin (Ctn)-producing C-cells. Prognosis correlates with primary tumor stage and Ctn levels.

Patient: We describe a case of MTC involving a mass 7 cm in its largest dimension, associated with high Ctn concentrations (> 5,000 pg/mL), but normal carcinoembryonic antigen levels, and with no lymph nodes or distant metastases, in complete remission after thyroid surgery. The MTC had very peculiar histological features, with an expansive, noninfiltrating growth around the thyroid follicles, and no signs of invasion. These histopathological characteristics are reminiscent of the C-cell adenoma described in animals. The tumor also revealed an ossifying extracellular matrix unlike the classical amyloid. Despite the size of the tumor and the patient's high Ctn levels at diagnosis, the case described here reached complete remission after surgery.

Conclusions: Further studies are needed to clarify the characteristics of MTC and better predict its behavior at diagnosis.

Original languageEnglish
Pages (from-to)108-112
Number of pages5
JournalEuropean Thyroid Journal
Volume8
Issue number2
DOIs
Publication statusPublished - Apr 2019

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