**Question:** Association of PSC with all except

A. Hepatitis B
B. Hepatitis C
C. Primary biliary cholangitis (PBC)
D. Autoimmune hepatitis

**Correct Answer:** .

**Core Concept:** Primary sclerosing cholangitis (PSC) is a chronic inflammatory disease of the bile ducts, characterized by progressive fibrosis and obliteration of the bile ducts. It is typically associated with certain underlying liver diseases.

**Why the Correct Answer is Right:** PSC is primarily associated with autoimmune hepatitis (D) and primary biliary cholangitis (C). Hepatitis B (A) and C (B) are viral hepatitis conditions that can lead to chronic liver disease, but they are not the primary cause of PSC. Autoimmune hepatitis is an autoimmune disorder where the immune system attacks the liver cells, leading to inflammation and fibrosis. Primary biliary cholangitis is another autoimmune liver disease characterized by destruction of bile ducts, which may share some clinical features with PSC, but the association is not as strong as autoimmune hepatitis or primary sclerosing cholangitis itself.

**Why Each Wrong Option is Incorrect:**

A. Hepatitis B: PSC is not commonly associated with hepatitis B infection. The association between PSC and hepatitis B is weaker than with autoimmune hepatitis or primary biliary cholangitis.

B. Hepatitis C: Similar to hepatitis B, the association between PSC and hepatitis C is weaker than with autoimmune hepatitis or primary sclerosing cholangitis.

C. Primary biliary cholangitis: While PSC and primary biliary cholangitis share some clinical features, the association between PSC and primary biliary cholangitis is not as strong as that between PSC and autoimmune hepatitis.

D. Autoimmune hepatitis: Autoimmune hepatitis is a strong risk factor for developing PSC. The association between PSC and autoimmune hepatitis is much stronger than with the other options.

**Clinical Pearl:** Autoimmune hepatitis and primary sclerosing cholangitis often coexist, leading to a high risk of developing PSC in patients with autoimmune hepatitis. This relationship is stronger than those with hepatitis B, C, and primary biliary cholangitis. A comprehensive evaluation of liver function and imaging studies is essential in patients with autoimmune hepatitis to identify those at risk for developing PSC and initiate appropriate monitoring and management strategies.