Pigmented dermatofibrosarcoma protuberans of the foot with fibrosarcomatous changes: a review and case presentation.

Pigmented dermatofibrosarcoma protuberans, also known as Bednar's tumor, is a rare, aggressive, cutaneous tumor. The lesion is highly invasive but metastasis is rare. This article presents a case of Bednar's tumor of the foot with fibrosarcomatous changes and a review of the differential diagnoses of this lesion.