Dermal cylindroma

In dermatologic pathology, a dermal cylindroma, also dermal eccrine cylindroma or cutaneous cylindroma) and (less specifically) cylindroma, is a benign adnexal tumor that occurs on the scalp and forehead.

Multiple cylindromas may grow together in a "hat-like" configuration, sometimes referred to as a turban tumor. Cylindromas are uncommon dysplasias of skin appendages.

Dermal cylindromas are:

They lack of a significant number of lymphocytes; this differentiates them from spiradenomas.