[Pilomatrix carcinoma: histologic and immunohistochemical features. Two studies].

Malignant pilomatricoma is a rare malignant hair follicle tumor, that was initially described in 1980. Histologically, it shares common features with the more frequent, which benign pilomatricoma, makes its diagnosis difficult. It is a deep dermis-hypodermis epithelial tumor, well circumscribed, with no relation with the epidermis.