Total removal of a large esophageal schwannoma by submucosal tunneling endoscopic resection: A case report and review of literature

Figure 3 Histology and immunohistochemistry of the tumor. A: Histopathologic findings revealed spindle-shaped cells in a fasciculated and disarrayed architecture, and no pathologic mitosis was observed (hematoxylin and eosin staining; (magnification, × 400); B: The mitotic activity rate was < 5% on Ki-67 staining (magnification, × 80); C: Immunochemical analysis revealed no staining with CD117 (magnification, × 80); D: Immunohistochemical examination revealed S-100 protein positivity (magnification, × 200).