Congenital duplex gallbladder and biliary mucocele associated with partial hepatic cholestasis and cholelithiasis in a cat.

A 6-year-old neutered male domestic shorthair cat was presented for acute onset of vomiting. Exploratory laparotomy identified a duplex gallbladder and left cholecystectomy was performed. Histopathology confirmed biliary mucocele and hepatic cholestasis. While rare, biliary mucoceles should be considered as a differential diagnosis for feline extrahepatic bile duct obstruction.