Dermatofibrosarcoma protuberans, commonly referred to as DFSP, are histologically-benign skin sarcomas which nonetheless exhibit malignant behavior manifesting as local invasion and recurrence.

A rare entity to begin with, they are perhaps even more rarely seen by radiologists, as they are not typically imaged. Apart from the imaging, this case exemplifies a typical presentation of DFSP: an indolent dermal/subdermal mass occurring along the trunk.

Due to a relatively high rate of local recurrence, management critically depends on resection with clean margins. This patient was treated by Mohs procedure, which was followed by deeper resection due to a positive deep margin.