Proliferating Trichilemmal Tumor (Pilar Tumour): A Case Report and Review of Literature

Abstract

Proliferating Trichilemmal Tumor (PTT) is a rare Neoplasm arising from theist thymus region of outer hair root sheath of the hair follicle. Historically characteristic is presence of trichilemmal keratinization, it is mostly benign in nature but rarely has potential form malignant transformation, usually present as a solitary Nodule on scalp of elderly women. Predilection more in women than men. Commonly age group between 3rd to 6th decades. Pleomorphic presentation may occur. Ghost Apocrines pindle cell can be sebaceous in nature. These grow well circumscribed in dermal layers. Subcutaneous Neoplasm with squamous cytological feature with progressive enlargement over several months to year. They form lobulated exophytic mass which may ulcerates thus mimicking of sebaceous cysts or squamous cell carcinoma.