title: Intrahepatic cholangiocarcinoma resembling a thyroid follicular neoplasm.
abstract: The first case of well-differentiated intrahepatic cholangiocarcinoma with remarkable follicular architecture resembling a follicular neoplasm of thyroid is described in a 52-year-old man. The follicles contained homogenous eosinophilic material akin to colloid and were lined by benign-looking cuboidal cells. Immunohistochemically, thyroid transcription factor-1 (TTF-1) and thyroglobulin were negative and the patient had no evidence of a previous or concomitant thyroid tumour. This case can be added to the list of extrathyroid primary tumours that resemble thyroid neoplasms.
authors.affiliation: Sezione Anatomia, Istologia e Citologia Patologica M. Malpighi, University of Bologna, Bologna, Italy.
authors.forename: Adele
authors.initials: A
authors.lastname: Fornelli
authors.forename: Arrigo
authors.initials: A
authors.lastname: Bondi
authors.forename: Elio
authors.initials: E
authors.lastname: Jovine
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Eusebi
mesh_terms: D018281:Cholangiocarcinoma / Q000473:pathology*; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology*; D008297:Male; D013964:Thyroid Neoplasms / Q000473:pathology*