Postpartum pneumoperitoneum and peritonitis after water birth.

Pneumoperitoneum (the presence of free gas in the peritoneal cavity) usually indicates gastrointestinal perforation with associated peritoneal contamination. We describe the unusual case of a 28-year-old female, who was 7 days postpartum and presented with features of peritonitis that were initially missed despite supporting radiological evidence. The causes of pneumoperitoneum are discussed. In the postpartum period the female genital tract provides an alternative route by which gas can enter the abdominal cavity and cause pneumoperitoneum. In the postpartum period it is important to remember that the clinical signs of peritonism, guarding and rebound tenderness may be diminished or subtle due to abdominal wall laxity.