A case of atrophic dermatofibrosarcoma protuberans

Atrophic dermatofibrosarcoma protuberans (DFSP is a rare variant of DFSP, which presents as a depressed scar-like lesion with atrophic patch. Although atrophic DFSP is identical to classical DFSP in biologic and histologic features, such atrophic lesions can be difficult to diagnose clinically. Better knowledge of atrophic DFSP is important for making an early diagnosis and for proper surgical treatment. We report the case of a 33-year-old female presented with a gray depressed atrophic patch with a skin-colored, pea-sized nodule on the left lateral rim, and an erythematous indurated plaque on her upper back. Histopathologically, the atrophic patch showed densely packed, monomorphous, plump spindle cells arranged in a storiform pattern, infiltrating the dermis and subcutaneous tissue, producing a characteristic honeycomb pattern. The tumor cells exhibited strong and diffuse positivity with CD34, establishing the diagnosis of DFSP.