Proliferating Trichilemmal Tumor of Scalp—An Eye Opener for a Pathologist

Proliferating trichilemmal tumor is a rare tumor of external root sheath of hair follicles, originating mainly from the scalp of middle-aged females. Grossly and microscopically, it mimics squamous cell carcinoma; hence, it is important to understand the cytological as well as histological features of this tumor diligently. In addition, there are no standard guidelines present for the treatment of these tumors and recurrence is not uncommon which make its management a challenge. Here we are reporting a case of a 65-year-old woman with proliferating trichilemmal tumor in a form of an ulcerated lobulated mass on her occipital area of the scalp.