Cholangiography Cholangiography A T-shaped rubber tube is inserted into the common bile duct to faciliate drainage after a cholecystectomy. A postoperative cholangiogram is the radiographic and flouroscopic examination of the biliary ducts after injection of contrast medium through the T-tube. To detect calculi, strictures, neoplasms, and fistulae in the biliary ducts. Seven to ten days after surgery, a contrast medium is injected through the T-tube. The contrast agent flows through the biliary ducts and outlines their size and patency, revealing any obstructions.
Biliary ducts demonstrate homogeneous filing with contrast medium and are normal in diameter.
Negative shadows or filling defects within the ducts may indicate calculi or neoplasms overlooked during surgery. Abnormal channels of the medium departing from the biliary ducts indicate fistulae.