title: Hyaline matrix in hyalinizing trabecular tumor: Findings in fine-needle aspiration smears.
abstract: Hyalinizing trabecular tumor (HTT) is a rare neoplasm which usually follows an indolent clinical course. The cytologic diagnosis of HTT can be challenging as these neoplasms share cytomorphological features with other thyroid neoplasms and paraganglioma. In fine-needle aspiration (FNA) smears a diagnosis of papillary thyroid carcinoma (PTC) or suspicion of PTC is often made. Herein we report cytologic findings in two patients with HTT examined by FNA. The key to a correct diagnosis is the recognition of a hyaline and colloid/amyloid-like material in the background of the smears. Immunocytochemical examination showing aberrant membranous and peripheral cytoplasmic staining for MIB-1 can help in rendering a correct diagnosis.
authors.affiliation: Department of Pathology, The Maria Skłodowska-Curie Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Elwira
authors.initials: E
authors.lastname: Bakuła-Zalewska
authors.affiliation: Department of Pathology, Skåne University Hospital, Lund, Sweden.
authors.forename: Robert
authors.initials: R
authors.lastname: Cameron
authors.affiliation: Department of Endocrinological Oncology and Nuclear Medicine, The Maria Skłodowska-Curie Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Jacek P
authors.initials: JP
authors.lastname: Gałczyński
authors.affiliation: Department of Pathology, Skåne University Hospital, Lund, Sweden.
authors.forename: Henryk A
authors.initials: HA
authors.lastname: Domanski
mesh_terms: D000368:Aged; D000974:Antibodies, Antinuclear / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D044963:Biopsy, Fine-Needle / Q000379:methods*; D003102:Colloids / Q000032:analysis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006818:Hyalin / Q000166:cytology*; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000473:pathology; D013964:Thyroid Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery
chemical_list: D000974:Antibodies, Antinuclear; D000911:Antibodies, Monoclonal; D003102:Colloids; D019394:Ki-67 Antigen; C440408:MIB-1 antibody
keywords: hyalinizing trabecular adenoma; hyalinizing trabecular tumor; medullary thyroid carcinoma; papillary thyroid carcinoma; thyroid