<prompt> Precancerous lesion of gall bladder isPorcelain gall bladderMirrizi syndromeCholesterosisAcalculous Cholecystitis  <response>: Ans is a ie Porcelain gall bladder The calcified porcelain gallbladder is associated with more than a 20 incidence of gallbladder carcinoma. These gallbladders should be removed, even if the patients are asymptomatic - Schwartz SurgeryMirizzi SyndromeBiliary obstruction may occur in cases of acute cholecystitis, as a result of external compression of the CBD by a large stone impacted in the Hartman pouch and the associated intense pericholecystic inflammatory process; this is termed Mirizzi Syndrome. Washington Manual of Surgery, 4e, p 310 