Sebaceous carcinoma.

A series of 11 sebaceous carcinomas is reported. None of the tumours recurred or metastasized. Two growth patterns were observed: basal-cell carcinomas with sebaceous differentiation, and pure sebaceous carcinomas. Since both these types may occur together they are considered to be merely variants of a single tumour entity. The clinical and histological characteristics of sebaceous carcinomas of our series are compared with those recorded in the literature. It is concluded that sebaceous carcinomas originate in the epidermis, in the skin appendages, or in both.