Medical Content Created by the Faculty of the
Harvard Medical School
Percutaneous transhepatic cholangiography is an x-ray test that can help show whether there is a blockage in the liver or the bile ducts that drain it. Since the liver and its drainage system do not normally show up on x-rays, the doctor doing the x-ray needs to inject a special dye directly into the drainage system of the liver. This dye, which is visible on x-rays, should then spread out to fill the whole drainage system. If it does not, that means there is a blockage. This type of blockage might result from a gallstone or a cancer in the liver.