Acute gastric dilatation (AGD) followed by necrosis is a rare and potentially fatal event; it is usually seen in patients with eating disorders such as anorexia nervosa or bulimia. A 13‑year‑old girl with no remarkable medical history was brought to the Emergency Department suffering acute abdominal symptoms. Emergency laparotomy revealed massive gastric dilatation and necrosis of most of the stomach. We performed subtotal gastrectomy and the patient recovered uneventfully. We report this case to demonstrate that AGD and subsequent gastric gangrene can occur in patients without any underlying disorders.