<prompt> Precancerous lesions of GB are all exceptProcelain GBTyphoid carrierABPDJBiliary ascariasis  <response>: Risk factors for Carcinoma Gallbladder Gallstones 3cm Procelain gallbladder Anomalous pancreaticobiliary junction APBDJ Choledochal cysts Adenomatous polyps Primary sclerosing cholangitis Obesity Salmonella typhi infection Ref: Sabiston 20th edition Pgno :1510 