Peritonitis from an abdominal wall biloma: a unique reason to avoid prophylactic surgical drainage.

Prophylactic drainage of the peritoneal space after major surgery is widely practised despite evidence against its efficacy. We describe the case of a 56-year-old woman who underwent a converted cholecystectomy and whose correctly sited abdominal drain resulted in the formation of a biloma between the external and internal oblique musculature. Subsequent leakage from the biloma into the abdominal cavity presented as peritonitis days after surgery, necessitating an emergency laparotomy. This case represents the first reported description of an abdominal wall biloma as a complication of post-cholecystectomy abdominal drainage. The evidence surrounding prophylactic drainage is discussed.