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[kÅlanâ²jÄÂ·Égramâ²]. an x-ray film of the bile ducts produced after injection of a radiopaque contrast medium. A cholangiogram is routinely performed before or after biliary tract surgery. A postoperative radiogram may be made after injecting an iodinated contrast medium through an indwelling T-tube.The medium also may be introduced directly into the biliary system or intravenously. See also cholangiography, cholecystography. cholangiogram is routinely performed before or after biliary tract surgery. A postoperative radiogram may be made after injecting an iodinated contrast medium through an indwelling T-tube. The medium also may be introduced directly into the biliary system or intravenously. See also cholangiography, cholecystography.
Percutaneous transhepatic cholangiography, or PTC, is a way of examining the bile duct system in the liver. This procedure is done under local anesthesia by a radiologist. During the exam, a thin needle is inserted through the skin (percutaneous) and through the liver (transhepatic) into a bile duct. Then dye is injected, and the bile duct system is outlined on x-rays (cholangiography).