Postoperative encapsulated hemoperitoneum in a patient with gastric stromal tumor treated by exposed endoscopic full-thickness resection: A case report

Figure 3 Postoperative pathological examination results. A and B: The tumor was located in the muscularis propria and was a spindle cell tumor, arranged in a bundle-like interweaving pattern with mild nuclear atypia (H&E, original magnification × 100); C and D: Immunohistochemical staining of tumor cells showed diffuse positivity for CD117 (C) and DOG1 (D), which were diffusely expressed on the surface of cell membranes.