Abstract

Dr. R. Ajitha*

ABSTRACT

Proliferating trichilemmal tumors(PTT) are benign solid-cystic neoplasms that show trichilemmal differentiation similar to that of isthmus of hair follicle. It comprises only 0.1% of skin biopsies. These tumors rarely exhibit malignant transformation. They develop from the wall of already existing pilar cyst in most cases. It is frequently seen in elderly women, more commonly on the scalp. Other locations could include face, trunk, back and forehead. These tumors are easily confused with squamous cell carcinomas. Malignant proliferating trichilemmal tumors carry significant morbidity and mortality, with possible recurrence after local excision. We present a case of a 65 year old female with rapidly growing swelling on the scalp, clinically suspected to be sebaceous cyst but later diagnosed with malignant proliferating trichilemmal tumor on histopathological examination. We also discuss the review of literature of this tumor considering the rarity of presentation.