Solitary jejunal diverticulum: a rare unexpected cause of chronic pneumoperitoneum.

Jejunal diverticula are a rare acquired herniation of the mucosa and submucosa through the muscularis propria. They are asymptomatic in the majority of cases; however, they can present with non-specific abdominal symptoms and rarely complicate leading to acute abdomen. Perforation usually results in symptoms and signs of acute peritonitis and it is not an identifiable aetiology of chronic pneumoperitoneum. Computed tomography scanning may identify intestinal wall oedema, air bubbles travelling through the mesentery, free intra-abdominal air and/or fluid. Radiological diagnosis requires a high index of suspicion of such pathology. We report a case of an isolated jejunal diverticulum as a cause for aseptic chronic pneumoperitoneum.