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The Korean Journal of Pathology 1990;24(2): 176-182.
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
1Department of Clinical Pathology, Catholic University Medical College, Seoul, Korea.
2United States Army Community Hospital (121 Evac. Hospital).
ABSTRACT
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.
Key Words: Proliferating trichilemmal tumor; Trichilemmal keratinization; pilar tumor
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