2 month history of right upper quadrant pain. Abdominal ultrasound showed a cystic lesion at the hepatic hilum.
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The gallbladder appears normal in size with thin wall, no gallstones seen. Its cystic duct is well-visualized.
Above the gallbladder there is another small rounded cystic structure containing sludge (hypointense on T2), communicating with the adjacent common hepatic duct through another separate cystic duct, well-visualized on cholangio-3D-MRCP.
MRCP should be performed for any suspicion of gallbladder duplication, especially if cholecystectomy is being considered, in order to inform the surgeon of the anatomical variation of the biliary system.