[Report of a case of perforated giant gastric malignant lymphoma].

A 54-year-old woman was found to have a gastric ulcer on medical examination, but the course with normal medication was monitored. Nine months later, she was transported to our hospital. A huge gastric ulcer was revealed and biopsy specimen indicated MALT lymphoma. We performed a total gastrectomy because it perforated before therapy, leaving a massive tumor. The final pathological diagnosis was DLBCL. She was administered rituximab-CHOP therapy for the remnant lesions. After 6 courses, the lesions disappeared. The patient has been alive without any recurrence or metastasis five years after surgery.