Rare adult gastric duplication cyst mimicking a gastrointestinal stromal tumor

Figure 1 Endoscopic view. A: Showing a subepithelial lesion with ulceration and blood clotting; B: Showing a hypoechoic lesion arising from the second and third layers of the gastric wall, with a central anechoic area.

Figure 2 Lesion was removed in an en-bloc fashion by an electrical snare. A: Submucosal layer after completion of the endoscopic mucosal resection; B: En-bloc resected tissue.

Figure 3 Histopathology and immunohistochemistry showing. A: The eroded gastric mass composed of dilated gastric glands surrounded by fibromuscular tissue, fibroblasts, and smooth muscle bundles; B: CD117-negative staining.