Which Artery Is Spared in Polyarteritis Nodosa?

Polyarteritis nodosa (PAN) spares large vessels (the aorta and its major branches), the smallest vessels (capillaries and small arterioles), and the venous system. Vascular lesions affect medium-sized muscular arteries and occur mainly at bifurcations and branch points.

What organ is spared in polyarteritis nodosa?

Polyarteritis nodosa (PAN) is a systemic necrotizing inflammation of blood vessels (vasculitis) affecting medium-sized muscular arteries, typically involving the arteries of the kidneys and other internal organs but generally sparing the lungs' circulation.

Why are lungs spared in polyarteritis nodosa?

Polyarteritis nodosa (PAN) is a blood vessel disease characterized by inflammation of small and medium-sized arteries (vasculitis), preventing them from bringing oxygen and food to organs . Most cases occur in the 4th or 5th decade of life, although it can occur at any age.