A series of 241 patients with subphrenic abscess was analysed to seek reasons for the continuing mortality. Aspects of pathology, clinical presentation, special investigations and management were affected by therapy with broad spectrum antibiotics to make diagnosis more difficult, particularly in relation to left subphrenic abscesses. When transperitoneal exploration and drainage were employed, high morbidity and mortality resulted. Satisfactory results followed extraserous drainage. The introduction of parenteral hyperalimentation promised control fistulas associated with abscesses, a situation hitherto associated with a poor prognosis.