Pseudo-Mirizzi syndrome in acute cholecystitis.

Common hepatic duct obstruction secondary to an impacted cystic duct stone is commonly referred to as the Mirizzi syndrome. Mirizzi syndrome is an uncommon cause of obstructive jaundice and can be mimicked by several other rare conditions. We describe a patient with a massively distended gallbladder due to acute cholecystitis who presented with clinical and cholangiographic findings simulating the Mirizzi syndrome. Endoscopists should be aware of acute cholecystitis as a possible etiology of common hepatic duct obstruction.