A Case of Trichilemmoma Arising in Nevus Sebaceus

Kim, Woo Jin; Shin, Dong Hoon; Choi, Jong Soo; Kim, Ki Hong

Abstract

In adulthood, nevus sebaceus is frequently associated with trichoblastoma and syringocystadenoma papilliferum. However, trichilemmoma rarely develops in nevus sebaceus. We report a case of nevus sebaceus associated with trichilemmoma in a 45-year-old female patient. She had three erythematous-to-normal skin-colored, well-demarcated verrucous-surfaced nodules on the right temporal area of the scalp, which were pea-to-bean sized. The histologic findings revealed characteristic features of nevus sebaceus. In the epidermis of the lesion, there were lobulated tumors consisting of clear cells with palisading columnar basal cells in the margin, and these were surrounded by a prominent basement membrane. The findings were consistant with trichilemmoma arising in nevus sebaceus.