Extraskeletal Ewing sarcoma of the stomach: A rare case report

Figure 4  Postoperative pathological examination. A: Hematoxylin and eosin staining. The tumor was identified to originate from the serous layer of the stomach and involve the muscularis externa of the stomach (20 ×). Upper right inset indicates small round cells with different sizes (original magnification, 200 ×); B-F: CD99-positive, vimentin-positive, FLI-1-positive, NSE-positive, amd SYN-positive cells (immunohistochemistry staining, 200 ×).