Question

Which of these is Hepatitis B infection most commonly associated with?

• A. PAN
• B. Cryoglobulinemia
• C. SLE
• D. Polymyositis

Hint:

HBsAg immune complexes deposit in medium arteries, linking Hepatitis B to polyarteritis nodosa (PAN).

Answer 1

The Correct Option is A

Step 1: Recall what Hepatitis B virus does beyond the liver.
Hepatitis B virus (HBV) does not only damage the liver. Circulating HBV antigen-antibody immune complexes can deposit in blood vessel walls elsewhere in the body and trigger inflammation there. This is called an extrahepatic immune complex disease.

Step 2: Name the classic extrahepatic disease of HBV.
The best known extrahepatic association of Hepatitis B is polyarteritis nodosa (PAN), a vasculitis of medium-sized arteries. A sizable fraction of PAN cases carry HBsAg (Hepatitis B surface antigen) in the blood, and immune complexes containing HBsAg have been found in the inflamed vessel walls of these patients.

Step 3: Separate this from Hepatitis C's association.
Mixed cryoglobulinemia is instead the classic extrahepatic disease linked to Hepatitis C virus, not Hepatitis B. Cryoglobulins are abnormal proteins that clump together in the cold and deposit in small vessels, and this link is strongest with chronic HCV infection.

Step 4: Rule out SLE and polymyositis.
Systemic lupus erythematosus (SLE) is an autoimmune disease driven by antinuclear antibodies and has no established strong link to Hepatitis B. Polymyositis is an inflammatory muscle disease and is not a recognised HBV complication either.

Final Answer:
Hepatitis B is most commonly linked to polyarteritis nodosa.
\[ \boxed{\text{PAN}} \]