A large cystic duct must be carefully traced to its junction with the infundibulum of the gallbladder to rule out the possibility that it is a major bile duct or accessory duct. A cholangiogram should be done to confirm the anatomy.
A long parallel channel between common and cystic duct may not be visible from externally, and the cystic duct junction may appear to be at its normal supraduodenal location. Prior to doing a cholecystojejunostomy to bypass a pancreatic cancer, it may be prudent to rule out this anomaly with a cholangiogram.
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