<prompt> Best method to visualize the proximal bile duct is by:Percutaneous transhepatic cholangiogramEUSERCPTransabdominal USG  <response>: IOC for proximal pa of biliary tract Percutaneous transhepatic cholangiogram both diagnostic and therapeutic IOC for distal pa of biliary tract ERCP both diagnostic and therapeutic IOC for most of biliary tract pathology like CBD stone; choledochal cyst; biliary stricture; cholangiocarcinoma MRCP only diagnostic 