Early gastric cancer presenting as a typical submucosal tumor cured by endoscopic submucosal dissection: A case report

Figure 4 Pathology of the endoscopically resected lesion. A: Gross appearance of the resected lesion, which had negative lateral margins. The black triangles indicate the border of the cancerous region; B: Hematoxylin & eosin stained section showing gastric wall mucosal layer elevation by the adenocarcinoma, central erosion, and exposed tumor cells (original magnification × 10); C: Microscopic finding of the boxed area in Figure B showing the periphery of the tumor mass, which demonstrated moderately differentiated adenocarcinoma (original magnification × 40); D: Microscopic finding of the vertical resection margin showing penetration of the muscularis mucosa and minute invasion of submucosa (depth of invasion 169 μm) by tumor cells (original magnification × 100).