Cylindroma: an update.

This paper reviews the recent literature on cylindroma, a rare tumor originating from the cutaneous adnexal structures of the scalp and face. Benign cylindroma is more frequent in women, and there are solitary and multiple forms, which are autosomal. Malignant cylindroma can occur in the Brooke-Spiegler syndrome, and malignant transformation is more frequent in multiple variants than in solitary tumors.