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The Korean Journal of Cytopathology 1997;8(2): 160-163.
Fine Needle Aspiration Cytologic Findings of Proliferating Trichilemmal Tumor.
Seok Jin Kang, Kyoung Mee Kim, Byung Ki Kim, Sun Moo Kim, Sang In Shim
Department of Clinical Pathology, Catholic University Medical College.
ABSTRACT
The cytologic finding of proliferating trichilemmal tumor is not well documented and have difficulties in the cytological analysis of the fine needle aspirates. This rare dermatopathologic entity may be encountered during aspiration biopsy of subcutaneous masses, and is, occasionally, confused with other neoplasm, particulary squamous carcinoma owing to its close cytological resemblance. We report a case of proliferating trichilemmal tumor in the left breast. The patient is a woman and had a lump in the breast for 20 years. Fine needle aspiration revealed a few small clusters of squamoid cells in the background of amorphous and calcified material. After excisional biopsy, the mass was confirmed as proliferating trichilemmal tumor. The main cytologic features discriminating squamous cell carcinoma were bland nature of epithelial cells, absence of atypical dyskeratotic cells, and rich amount of amorphous material.
Key Words: Proliferating trichilemmal tumor; Fine Needle Aspiration Cytology