The resected specimen (Fig. 2A and 2B) showed that the tumor contained a proliferation of spindle-shaped cells arranged in a fascicular pattern (Fig. 2C), which was immunohistochemically positive for desmin (Fig. 2E), SMA (Fig. 2F), h-caldesmon, CAM5.2, and EMA (data not shown), and negative for c-kit, AE1/AE3, CD34, and S-100 (data not shown). This evidence concerns the gene SMN1 and neoplasm.