recently the technique of imaging diagnosis has been developed and biliary tract carcinomas without any symptoms can be diagnosed by us , ct and cholangiography , but preoperative definitive diagnosis should be carried out by percutaneous transhepatic cholangioscopy ( ptcs ) or percutaneous transhepatic cholecystoscopy ( ptccs ) especially in cases of minute lesions , superficial spreading type carcinomas or biliary tract carcinomas complicated with gall stones .
C0005423
biliary tract
C0008350
gall stones