Table 1.

Expected immunophenotypes of muscle tumors after staining of formalin-fixed tissues

	Vimentina	Desmin	α-Smooth muscle actin	Myoglobin
Leiomyoma and leiomyosarcoma	+	+	+	–
Rhabdomyoma and rhabdomyosarcoma	+	+	–	+
Other mesenchymal tumors	+	–	–	–

^aVimentin might not be expressed in benign muscle tumors or well-differentiated or low-grade malignant muscle tumors.