[Gallbladder diaphragm: an unusual cause of acute alithiasic cholecystitis complicated of biliary peritonitis].

The gallbladder diaphragm is a very rare abnormality of the embryogenesis. It is an exceptional cause of biliary peritonitis. We report a 54-year-old man who presented with hepatic colic for the past 2 years. Imaging disclosed evidence of alithiasic cholecystitis on gallbladder diaphragm. The coelioscopic exploration confirmed the diagnosis and an associated presence of a biliary peritonitis. A cholecystectomy and a peritoneal washing were performed. The histological examination ruled in the diagnosis of cholecystitis on gallbladder diaphragm. The embryogenesis, the histological and morphological features as well as the treatment are discussed.