Dermatomyofibroma—A rare mesenchymal tumor with maintained horripilation

Abstract

Dermatomyofibroma is a rare mesenchymal tumor of skin. The major differential diagnosis is dermatofibrosarcoma protuberans. Both lesions are composed of spindle‐shaped cells which are CD34‐positive. In contrast to the malignant counterpart, the tumor cells in dermatomyofibroma are without any evidence of COL1A1‐PDGFB gene rearrangement. We present a case of axillary dermatomyofibroma in a 31‐year‐old woman. A hitherto undescribed clinical phenomenon is a maintained horripilation in contrast to dermatofibrosarcoma protuberans.