title: Medullary thyroid carcinoma mimicking an autonomous functioning nodule.
abstract: A 42-year-old woman with a medullary thyroid carcinoma (MTC) inside of an autonomously functioning thyroid nodule is reported. The patient was initially diagnosed of a hyperfunctioning autonomous thyroid adenoma but the histopathological and immunohistochemistry study were diagnostic for a MTC. This is the first case of a medullary thyroid carcinoma associated with thyroid hyperfunction which was presented as a hot nodule in the scintigraphy. We propose a systematic performance of a fine needle biopsy in all thyroid nodules because of the possibility of carcinoma associated to functioning nodules could be present.
authors.affiliation: Internal Medicine Department, Hospital Joan XXIII, Tarragona, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Rivas
authors.forename: C
authors.initials: C
authors.lastname: Gutiérrez
authors.forename: J
authors.initials: J
authors.lastname: Vendrell
authors.forename: S
authors.initials: S
authors.lastname: Razkin
authors.forename: C
authors.initials: C
authors.lastname: Richart
mesh_terms: D000328:Adult; D018276:Carcinoma, Medullary / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D013667:Technetium; D013964:Thyroid Neoplasms / Q000175:diagnosis* / Q000473:pathology; D016606:Thyroid Nodule
chemical_list: D013667:Technetium