case_images: PMC4715890_01
case_images: Figure 1:H and E stain: at low magnification sub-mucosal proliferation within the muscularis propria (A-B); at higher magnification epithelioid pleomorphic or fusiform cells (C-D).
case_images: ajcr-7-8.f1.jpg
case_images: PMC4715890_01_ajcr-7-8.f1.jpg
case_images: F1
case_images: At immunohistochemistry, the lesion was positive for Vimentin, S 100, CD 34, Caldesmone; weakly positive for CD 30 and Actin; negative for EMA, CD 117 (c-kit), CD 68, HMB 45, ALK, Cytokeratin, AE1 / AE3, Desmin, CD 21, Neu N (Fig. 1,2).