Tension pneumoperitoneum: a report of 4 cases.

Four cases of tension pneumoperitoneum are described. In 3 patients this condition followed a perforation of a grossly distended caecum. In 2 of these patients there was an associated malignant neoplasm of the pelvic colon with obstruction. The third patient had a pseudo-obstruction of the transverse colon. The fourth patient had a tension penumoperitoneum with associated surgical emphysema in the neck and subcutaneous tissues of the abdomen and chest walls, following perforation of a duodenal ulcer. The aetiology, presentation and management, together with the mechanism of tension pneumoperitoneum, are discussed.