Endoscopic diagnosis of early-stage primary esophageal small cell carcinoma: Report of two cases

Figure 3 Histological findings of the resected specimen (Case 2). A: The specimen resected by endoscopic submucosal dissection; B: The macroscopic appearance of the small cell carcinoma; C: The tumor was partially covered by a non-neoplastic epithelium (hematoxylin and eosin staining, magnification × 100); D: The small cell carcinoma component observed in a high power field (magnification × 400); E: Immunohistochemical staining showed that synaptophysin were positive (hematoxylin and eosin staining); E: Ki-67 index was 80%.