A percutaneous transhepatic cholangiogram (PTCA) is an x-ray of the bile ducts inside and outside the liver. The x-ray is taken after contrast medium (dye) is injected directly into the area being studied.

The test is performed in a radiology department by a radiologist. You will be asked to lie on your back on the x-ray table. The upper right side of your abdomen will be cleansed and you will be given a local anesthetic. A long, thin, flexible needle is then inserted through the skin into the liver.

With guidance from the fluoroscope (an x-ray machine that projects images onto a TV screen), the bile duct is located and the contrast medium injected. The contrast medium then flows through the ducts and can be seen on the fluoroscopic monitor.

Inform the health care provider if you are pregnant. You will be given a hospital gown to wear and will be asked to remove all jewelry.

There will be a sting as the anesthetic is given and some discomfort as the needle is advanced into the liver. You may be given medication for sedation and/or pain control. Generally, the x-ray itself causes little or no discomfort.