What Is Primary Sclerosing Cholangitis?
Primary sclerosing cholangitis (PSC) is an uncommon, slowly progressive bile duct disease that results in stagnation or build-up of bile in the liver, called cholestasis.
Primary sclerosing cholangitis is characterized by sclerosis, or scarring inflammation in bile ducts both within the liver (intra-hepatic ducts), and outside the liver (extra-hepatic ducts), causing progressive narrowing and, eventually, obliteration of the bile ducts.
Primary sclerosing cholangitis comes under the umbrella term autoimune liver disease in which the end result is immune-mediated hepatocellular (liver cell) or hepatobiliary (bile duct) injury.1 
Q: What happens when scarred bile ducts can no longer transport bile out of the liver?
A: Bile that cannot be removed from the liver by the biliary duct system backs up and damages the liver, causing cirrhosis.
Bile is continually made by the liver from phospholipids salt, cholesterol, and aging blood cells that it removes from circulation to be carried out of the liver. Bile also carries away waste products produced by normal metabolism and toxic substances that are removed by the liver for eventual elimination in stool. As such, bile must continually flow out of the liver to prevent build-up in the liver.
Bile is a greenish brown liquid made by the liver. Bile ducts carry it out of the liver to the gall bladder for storage until needed to aid in the digestion and absorption of fat from the small intestine. Bile emulsifies fat eaten in the diet so that the pancreatic enzyme called lypase can break it down into its fatty acid and glycerol components.
The liver is the largest organ within the body. It lies mostly in the upper part of the abdomen on the right side just under the diaphragm. About 70% of liver tissue is made up of cube shaped cells called hepatocytes that do the main work of the liver. Other cells (epithelial) form structure and are arranged in single layers around blood vessels, sinusoids, and bile ducts.
Build-up of bile in the liver is the end result of the inflammatory process in primary sclerosing cholangitis, that by swelling and scarring of bile ducts impedes and eventually prevents bile flow out of the liver, leading to liver failure. There is no curative treatment available for primary sclerosing cholangitis, besides liver transplantation.2 
The appearance of the intrahepatic and extrahepatic biliary ducts can be assessed by use of cholangiography, and magnetic resonance (MR) imaging is the best way to identify patients. See image above.3 
MR cholangiography offers a noninvasive method of obtaining images of the biliary system without the use of a contrast agent. There is no radiation exposure. Pulse sequences can be chosen to obtain bright bile or black bile cholangiograms. Image processing algorithms can be selected to obtain a three-dimensional representation of biliary anatomy and pathology, and those images can be rotated in any plane so that ductal anatomy and pathology can be seen to best advantage.4 
There is no cure for primary sclerosing cholangitis but there are symptom treatments one of which is supplementation for low levels of vitamins A,D,E, and K. Liver transplant is the only effective option.
What Is Primary Sclerosing Cholangitis In Celiac Disease and/or Gluten Sensitivity?
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Trivedi PJ, Adams DH. Mucosal immunity in liver autoimmunity: a comprehensive review. J Autoimmun. 2013 Oct;46:97-111. doi: 10.1016/j.jaut.2013.06.013. ↩ 
Kummen M, Schrumpf E, Boberg KM. Liver abnormalities in bowel diseases. Best Pract Res Clin Gastroenterol. 2013 Aug;27(4):531-42. doi: 10.1016/j.bpg.2013.06.013. ↩ 
Eaton JE, Talwalkar JA, Lazaridis KN, Gores GJ, Lindor KD. Pathogenesis of primary sclerosing cholangitis and advances in diagnosis and management. Gastroenterology. 2013 Sep;145(3):521-36. doi: 10.1053/j.gastro.2013.06.052. Epub 2013 Jul 1. ↩ 
Meakem TJ 3rd, Schnall MD. Magnetic resonance cholangiography. Gastroenterol Clin North Am. 1995 Jun;24(2):221-38. ↩