From 1985 to 1989, a total of 598 gastric cancer patients underwent gastrectomies in the First Department of Surgery at Kurume University School of Medicine. Of these, 24 patients (4.0%) incurred a subphrenic abscess, postoperatively. Subphrenic abscesses occurred most frequently after total gastrectomies at a rate of 17 of 197 (8.8%) cases. Leaking gastrointestinal anastomoses were responsible for 12 of the 17 (70.5%) abscesses. In 384 cases of distal gastrectomy, only 6 (1.6%) cases with a subphrenic abscess occurred, and only 3 were due to anastomotic leakage. Among the total of 24 cases with subphrenic abscesses, 16 (67%) were related to an anastomotic leakage including a pancreatic fistula, while the other 8 (33%) showed no leakage by contrast roentgenography. When chest roentgenography shows a pleural effusion and an elevation of the diaphragm, then a subphrenic abscess must be suspected. The majority of patients were treated by replacing the intraabdominal drainage catheter inserted during the gastrectomy with a larger catheter. The overall operative mortality rate was 4.1% due to a death in only one (MOF) patient.