Abstract
We report a patient with a gastrocolic fistula caused by a gastric malignant lymphoma. A 67-year-old male was admitted due to frequent diarrhea. On colonoscopy examination and gastoroscopy a fistula between the transverse colon and the middle of the body of the stomach was found. Since no evidence of malignant was found in the biopsy specimens, a gastrocolic fistula due to a gastric ulcer was diagnosised, and curative surgery was performed. Since the possibility of malignant lymphoma was suggested on quick-section examination, a total gastrectomy, transverse colectomy and a partial excision of the body of pancreas cauda were done. The final histopathological diagnosis was malignant lymphoma, with the lesion infiltrating in the pancreatic body and lymph nodes.