Intraepidermal sebaceous carcinoma: case report.

We report a rare case of intraepidermal sebaceous carcinoma which occurred on the left upper arm of an old woman. Light-microscopic findings revealed that almost all the histopathological lesions were in the epidermis and showed pagetoid spread. The tumor was well differentiated and consisted of germinative, transitional and sebaceous cells. Mitosis and mild and moderate pleomorphism were observed. Ultrastructural findings revealed lipid droplets in the tumor cells although Sudan III staining failed to show any positive materials.