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GASTRIC SUBMUCOSAL HETEROTOPIA OF THE IMMATURE GASTRIC GLANDS WITH ENDOSCOPIC FEATURE MIMICKING CARCINOID TUMOR

We describe a rare case of gastric submucosal heterotopia of the immature gastric glands mimicking carcinoid tumor shown by endoscopic examination, which was successfully treated by endoscopic tumor resection. A 66‐year‐old woman was admitted to our hospital for further examination of the gastric abnormality. Endoscopic examination of the upper gastrointestinal tract revealed a flat, rounded elevated lesion with a central erosion in the anterior wall of the upper gastric body. Endoscopic ultrasonography revealed a poorly demarcated, slightly hypoechoic lesion located in the third layer of the gastric wall. Based on these findings, a submucosal tumor, particularly a carcinoid tumor, was suspected. Endoscopic tumor resection, which provides a significant benefit for accurate final diagnosis and eradication of submucosal lesion, was performed. Histological study showed the gastric gland heterotopia of immature type in the submucosa.