Pilomatricomal horn: a new superficial variant of pilomatricoma.

We describe a pilomatricomal horn on the right arm of a 39-year-old man. Although initially the tumor was clinically thought to be a verruca vulgaris, the microscopic features were similar to those found in classic pilomatricoma, except for the epidermal location and the presence of a cutaneous horn. Light microscopy showed replacement of the epidermis by basaloid cells, with masses of cornified material containing shadow cells that formed a cutaneous horn.

Cutaneous horns of the eyelid: a clinicopathological study of 48 cases.

Background: Cutaneous horn (cornu cutaneum) is a morphological designation for a protuberant mass of keratin that resembles the horn of an animal. It results from unusual cohesiveness of keratinized material from the superficial layers of the skin or implanted deeply in the cutis. This lesion may be associated with a benign, premalignant, or malignant lesion at the base, masking numerous conditions.