Journal of Pathology and Translational Medicine

Original Article

Fine Needle Aspiration Cytologic Findings of Proliferating Trichilemmal Tumor.: Seok Jin Kang, Kyoung Mee Kim, Byung Ki Kim, Sun Moo Kim, Sang In Shim; Korean J Cytopathol. 1997;8(2):160-163.

Abstract PDF: 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.

Case Report

Proliferating Trichilemmal Tumor: Report of four cases.: Yeong Jin Choi, Mi Kyung Jee, Seok Jin Gang, Byoung Kee Kim, Sun Moo Kim, Soo Il Chung; Korean J Pathol. 1990;24(2):176-182.

Abstract PDF: Proliferating trichilemmal tumor is relatively rare, and is generally considered to be a benign tumor that can be histologically mistaken for well-differentiated squamous cell carcinoma. The proliferating trichilemmal tumor is thought to be a tumor with differentiation toward the hair structure because the characteristic trichilemmal keratinization in this tumor is analogous to that of the outer root sheath of anagen hair or the trichilemmal sac surrounding catagen hair. We report four cases of proliferating trichilemmal tumor removed by surgical excision.

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