Abstract
A 55-year-old Japanese woman was first seen in August 1987 with a 30-year history of a slowly growing painfull mass on her back, measuring 7.8×6.5 cm. The gross specimen disclosed a firm, circumscribed mass with giant comedones on the surface, containing cheesy materials. The tumor was located in the dermis and subcutaneous fat tissue. Microscopic examination revealed nests of basaloid cells with high mitotic activity. The basaloid cell islands showed peripheral palisading of nuclei and a sharp transition to amorphous debris or shadow cells. The tumor recurred 14 months later after the initial surgery and a wide resection was performed. There has been no evidence of recurrence for 6 months after the second surgery.
