Case report
A 49-year-old man presented with a complaint of abdominal distension with decreased appetite for one month. The patient had no abdominal pain, hematemesis, melena, or other symptoms. There was no history of weight loss or family history of gastrointestinal disease. Other vital signs were normal. Abdominal physical examination showed no obvious abnormalities. Laboratory tests showed normal blood routine and tumor markers. Fecal occult blood was negative. Gastroscopy revealed a mucosal protuberous lesion in the greater curvature of the stomach, about 2.0cm×3.0cm in size, extending to the pyloric canal, which was resected by high-frequency electric coil (Fig.1). The pathological diagnosis was ectopic gastroduodenal mucosa with adenomatous hyperplasia.