A 19-year-old hemophilia patient with abdominal pain over the past three days and hematemesis. Contrast-enhanced CT in the portal phase demonstrates the presence of a large ulcer in the greater gastric curvature (arrow) communicating the stomach lumen with retrogastric liquid collection with increased density, suggesting hematic origin (asterisk). There is no evidence of active bleeding. Upper digestive endoscopy, performed after CT, demonstrated the presence of extensive ulcerated lesion on the posterior wall of the gastric body, measuring approximately 7.0 cm, with fibrin in the base, and a large orifice (4.0 cm diameter) communicating with a large cavity, constituted of walls covered by blood and clots. Histological study of the lesion did not reveal any signs of neoplasia.