There are nine cases in the literature of gallbladder interposition, with the hepatic ducts draining directly into the body of the gallbladder, and the cystic duct the only outlet of the gallbladder. The only possible warning of this anomaly would be a cholangiogram that failed to fill hepatic radicals. Transection of the hepatic ducts with cholecystectomy requires Roux-en-Y hepaticojejunostomy reconstruction. (This is a reconstructed image. There are no pre-transection cholangiogram images in the literature).
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The gallbladder may be absent, intrahepatic or on a mesentery. There may be septations, diverticula and duplications. Duplicate gallbladders may be on the same or opposite side of the falciform and may drain by two separate cystic ducts or a common cystic opening (Y-shape). Failure to find a non-visualizing gallbladder at surgery could be either agenesis (rare) or intrahepatic location. The latter could be hard to locate and require intraoperative ultrasound.
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