title: Warthin's tumour: unusual vs. common morphological findings in fine needle aspiration biopsies.
abstract: Fine needle aspiration biopsies (FNA) of 47 Warthin's tumours confirmed by histology were re-evaluated for cytomorphological findings. The majority of aspirates (37/47) contained a typical background with proteinaceous substance and cell debris, along with cellular elements represented by oncocytic, lymphoid, and mast cells with degranulated cytoplasm. Uncommon cellular findings were true squamous cells (1/47), atypical cells with vacuoles (1/47), osteoclastic giant cells (1/47), epithelioid cells (1/47), mast cells with preserved granules in cytoplasm (3/47), and siderophages (4/47). Uncommon findings in the background were corpora amylacea-like structures and homogeneous bright red droplets. Squamous cells and atypical cells with vacuoles caused diagnostic difficulties in distinguishing a Warthin's tumour from a squamous cell or mucoepidermoid carcinoma. However, other unusual cellular and background findings were not worrying; therefore, they are merely regarded as a curiosity in the cytomorphological appearance of the tumour.
authors.affiliation: Department of Cytopathology, Institute of Oncology, Zaloska 2, SI-1105 Ljubljana, Slovenia. mfiezar@onko-l.sl
authors.forename: Margareta
authors.initials: M
authors.lastname: Flezar
authors.forename: Ana
authors.initials: A
authors.lastname: Pogacnik
mesh_terms: D000235:Adenolymphoma / Q000473:pathology* / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012468:Salivary Gland Neoplasms / Q000473:pathology* / Q000601:surgery