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We report a case of a man in his early 50 s who was admitted to our hospital for anorexia. An imaging examination led to a preoperative diagnosis of a gastrointestinal stromal tumor and gallbladder stones. He underwent treatment by laparoscopic cholecystectomy and distal partial gastrectomy with lymph node dissection. The final histopathological diagnosis was gastric schwannoma and tubular adenoma of the gallbladder. Gastric schwannoma accounts for only 0.2% of all gastric tumors, and tubular adenoma constitutes only 2.2% of gallbladder tumors. This report describes the diagnosis and treatment process for this combination of tumors, thus providing a reference for similar cases.