Hartmann's pouch
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Hartmann’s pouch is an out-pouching of the wall of the gallbladder at the junction of the neck of the gallbladder and the cystic duct. It is probably caused by a single large stone lodged at the junction for a long time as the Hartmann's pouch is not usually found in the normal anatomy. Its identification is useful in delineating biliary anatomy when performing a cholecystectomy. It is named after Henri Albert Hartmann who first described it.