GIANT-CELL FIBROBLASTOMA WITH PIGMENTED DERMATOFIBROSARCOMA PROTUBERANS COMPONENT

A unique case of giant-cell fibroblastoma that contained a pigmented d ermatofibrosarcoma component (Bednar tumor) is described. The melanin pigmented dendritic cells found in the dermatofibrosarcoma component w ere round or spindle-shaped and had bipolar extensions. They were S-10 0 protein positive. Our case indicates the close histogenetic relation ship between giant-cell fibroblastoma and dermatofibrosarcoma protuber ans. The occurrence of the pigmented melanin-laden dendritic cells in our tumor further substantiates the theory that Bednar tumor is a pigm ented variant of dermatofibrosarcoma protuberans.