Sebaceous carcinoma of the eyelid: a review of 14 cases.

Background: Sebaceous carcinoma of the eyelid is a rare tumor. Treatment can be complicated by noncontiguous spread of the tumor.

Objective: Review a series of patients with sebaceous carcinoma to illustrate clinical presentations, treatments, and outcomes.

Microcystic adnexal carcinoma (MAC) of the scalp with extensive pilar differentiation.

Background: Microcystic adnexal carcinoma (MAC), or sclerosing sweat duct tumor, is an uncommon, locally aggressive tumor. It typically involves the upper lip or face of middle-aged adults and rarely involves the scalp. It is characterized histologically by both pilar and eccrine differentiation and is associated with frequent perineural invasion.