Abstract
A 79-year-old man first noticed the appearance of a nodule on his left thigh about the size of a little finger’s head about 10 years ago, which slowly increased in size to finally form a horn-like tumor with a red halo. The horn was gray or yellowish gray in color, measuring 4 cm in length and 1 cm in diameter. Histologically, there was a mass of keratotic horny cells with trichilemmal keratinization at the base. The histopathologic features support a diagnosis of trichilemmal horn which was first identified by Brownstein in 1979.
