Most of the time, this test is done after an endoscopic retrograde cholangiopancreatography (ERCP) test has been tried first. The PTC may be done if an ERCP test cannot be performed or has failed to clear the blockage.
A magnetic resonance cholangiopancreatography (MRCP) is a newer, noninvasive imaging method, based on MRI. It also provides views of the bile ducts, but it is not always possible to do this exam. Also, MRCP cannot be used to treat the blockage.
A percutaneous transhepatic cholangiogram (PTCA) is an x-ray of the bile ducts. These are the tubes that carry bile from the liver to the gallbladder and small intestine.
How the Test is Performed
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 provider will clean the upper right and middle area of your belly area and then apply a numbing medicine.
X-rays are used to help the health care provider locate your liver and bile ducts. A long, thin, flexible needle is then inserted through the skin into the liver. The provider injects dye, called contrast medium, into the bile ducts. Contrast helps highlight certain areas so they can be seen. More x-rays are taken as the dye flows through the bile ducts into the small intestine. This can be seen on a nearby video monitor.
You will be given medicine to calm you (sedation) for this procedure.
How the Test will Feel
There will be a sting as the anesthetic is given. You may have some discomfort as the needle is advanced into the liver. You will have sedation for this procedure.
How to Prepare for the Test
Inform your provider if you are pregnant. You will be given a hospital gown to wear and you will be asked to remove all jewelry.
You will be asked not to eat or drink anything for 6 hours prior to the exam.
Tell your provider if you are taking any blood thinners such as Warfarin (coumadin), Plavix (clopidrogrel), Pradaxa, or Xarelto.
The bile ducts are normal in size and appearance for the age of the person.
There is a slight chance of an allergic reaction to the contrast medium (iodine). There is also a small risk for:
- Damage to nearby organs
- Excessive blood loss
- Blood poisoning (sepsis)
- Inflammation of the bile ducts
What Abnormal Results Mean
The results may show that the ducts are enlarged. This may mean the ducts are blocked. The blockage may be caused by scarring or stones. It may also indicate cancer in the bile ducts, liver, pancreas, or region of the gallbladder.
Why the Test is Performed
This test can help diagnose the cause of a bile duct blockage.
Bile is a liquid released by the liver. It contains cholesterol, bile salts, and waste products. Bile salts help your body break down (digest) fats. A blockage of the bile duct can lead to jaundice (yellow discoloration of the skin), itching of the skin, or infection of the liver, gallbladder or pancreas.
When it is performed, PTCA is most often the first part of a two-step process to relieve or treat a blockage.
- The PTCA makes a "roadmap" of the bile ducts, which can be used to plan the treatment.
- After the roadmap is done, the blockage can be treated by either placing a stent or a thin tube called a drain.
- The drain or stent will help the body get rid of the bile from the body. That process is called Percutaneous Biliary Drainage (PTBD).
Jackson PG, Evans SRT. Biliary system. In: Townsend CM Jr, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 20th ed. Philadelphia, PA: Elsevier; 2017:chap 54.
Lidofsky SD. Jaundice. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 21.