[A case of primary lymphoma of the stomach, diffuse lymphoplasmacytic type, with massive hematemesis].

A case of primary lymphoma of the stomach with massive hematemesis and melena who underwent emergency gastrectomy is reported. The patient was a 72-year-old woman. The tumor was 3.5 X 3.0 cm in size and occupied the posterior wall of the upper part of the gastric body. The surface of the tumor was covered with hematoma, and was there was a lack of gastric mucosa. Histological diagnosis of the tumor was primary gastric lymphoma, diffuse lymphoplasmacytic B-cell type, and monoclonal kappa-light chain was demonstrated by the immunohistochemical method. The bleeding source of the tumor tissues was a ruptured artery invading the tumor tissue in the submucosal layer of the stomach.