Figure 3From: Malignant mesenchymal tumor with leiomyosarcoma, rhabdomyosarcoma, chondrosarcoma, and osteosarcoma differentiation: case report and literature reviewThis high-grade sarcoma shows muscle differentiation because of focally positive immunoreactivity to (A) calponin, (B) myoglobulin, and (C) smooth muscle actin antibodies. (D) It also expressed a high proliferation index by Ki-67 staining (×200).Back to article page