Table 1. Immunohistochemistry of dermatomyofibroma and other tumors

Antigen	Muscle actin	CD-34	Factor XIIIa	Desmin	S-100
Dermatomyofibroma	+	–	–	–	–
Dermatofibrosarcoma protuberans	–	+	–	–	–
Dermatofibroma	–	–	+	–	–
Piloleiomyoma	+	–	–	–	+
Neurofibroma	–	+/–	–	–	+