Polyarteritis nodosa spares which type of vessels?

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Multiple Choice

Polyarteritis nodosa spares which type of vessels?

Explanation:
Polyarteritis nodosa is a medium-vessel vasculitis, meaning it primarily targets medium-sized muscular arteries and causes transmural necrotizing inflammation with aneurysm formation. Small vessels, including arterioles, capillaries, and venules, are typically spared. Among the given vessel types, arterioles (the small branches of arteries) are the ones spared, which is why this option is the best choice. This pattern helps distinguish PAN from small-vessel vasculitides that involve capillaries and venules, and from vessel types that PAN does affect, like medium arteries.

Polyarteritis nodosa is a medium-vessel vasculitis, meaning it primarily targets medium-sized muscular arteries and causes transmural necrotizing inflammation with aneurysm formation. Small vessels, including arterioles, capillaries, and venules, are typically spared. Among the given vessel types, arterioles (the small branches of arteries) are the ones spared, which is why this option is the best choice. This pattern helps distinguish PAN from small-vessel vasculitides that involve capillaries and venules, and from vessel types that PAN does affect, like medium arteries.

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