|Classification and external resources|
Micrograph showing a Rokitansky–Aschoff sinus. H&E stain.
They are not of themselves considered abnormal, but they can be associated with cholecystitis.
They form as a result of increased pressure in the gallbladder and recurrent damage to the wall of the gallbladder. They are associated with gallstones (cholelithiasis).
See also 
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