Two cases of pilomatrix carcinoma.

We report two cases of pilomatrix carcinoma. Wide surgical excision, radiation, and chemotherapy were required for the first patient. The tumor eventually revealed the characteristics of a carcinoma, both clinically and histopathologically, as it recurred. In the second case, although the tumor exhibited the histology of pilomatricoma in the central part of the lesion, there were numerous outgrowing irregular nests of basaloid tumor cells with cellular atypia and frequent mitoses; these are the characteristic features of the pilomatrix carcinoma in its early stages.