issues in differential diagnosis are discussed for the following findings : internal gallbladder echoes ( calculi vs tumefactive sludge , air , hematobilia , parasitic infestation , cholecystosis , neoplasia , and artifacts ) , gallbladder wall thickening ( acute cholecystitis vs acalculous cholecystitis , artifacts , ascites , hypoalbuminemia , hepatitis , and sclerosing cholangitis ) , pericholecystic fluid ( cholecystitis vs ascites , perforated ulcer , and trauma ) , bile duct dilatation ( biliary obstruction vs sclerosing cholangitis , biliary air , anomalous portal system , biliary atresia , caroli disease , and cholangiocarcinoma ) , perinatal and neonatal biliary disease , and sclerosing cholangitis .
C0016976
gallbladder
C0008325
cholecystitis