Combined Papillary and Mucoepidermoid Carcinoma of the Thyroid Gland: a Possible Collision Tumor Diagnosed on Fine-Needle Cytology. Report of a Case with Immunocytochemical and Molecular Correlations

Franco Fulciniti, Emilia Vuttariello, Celeste Calise, Mario Monaco, Luciano Pezzullo, Maria Grazia Chiofalo, Francesca Di Gennaro, Maria Gabriella Malzone, Anna Cipolletta Campanile, Nunzia Simona Losito, Gerardo Botti, Gennaro Chiappetta

Research output: Contribution to journalArticle

Abstract

Fine-needle cytology (FNC) is frequently used to diagnose thyroid nodules discovered by palpation or imaging studies. Molecular tests on FNC material may increase its diagnostic accuracy. We report a case of a classic papillary thyroid carcinoma combined with a mucoepidermoid carcinoma correctly identified on FNC. The papillary component had a classic immunophenotype (CK19+, TTF1+), while the mucoepidermoid one was only focally CK19+. Point mutations (BRAF and RAS) and rearrangements (RET/PTC) of the papillary component have been also investigated on FNC samples, with resulting concurrent rearrangements of RET/PTC1 and RET/PTC3, but no point mutations. The histogenesis of combined papillary and mucoepidermoid carcinoma of the thyroid still remains partly unsettled, and further genomic studies are needed to shed some more light on this peculiar neoplasm.

Original languageEnglish
Article number7
Pages (from-to)140-144
Number of pages5
JournalEndocrine Pathology
Volume26
Issue number2
DOIs
Publication statusPublished - Mar 14 2015

Keywords

  • BRAF and RAS point mutations
  • Fine-needle cytology
  • Papillary thyroid carcinoma
  • RET/PTC rearrangement

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

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