Dermatofibrosarcoma protuberans of the breast.

Dermatofibrosarcoma protuberans is a rare soft tissue cancer of the skin with the potential for intermediate malignity, characterized by local invasion and recurrence. Presenting with local atrophic and sometimes erythematous plaques, these lesions are best treated with surgery in which large excisions are necessary to reduce the risk of recurrence and to prevent rarely seen metastases. We report on a 26-year-old female patient with dermatofibrosarcoma protuberans on her breast, an very unusual site. As a novel surgical approach to treat the patient's tumor, a keyhole pattern was used, allowing wide safety margins during resection, while preserving the cosmetic appearance of the breast.