Polyaeritis nodosa does not involve in

Refer robbins 9/e 509/510 Polyaeritis nodosa (PAN), is a systemicnecrotizing inflammation of blood vessels (vasculitis) affecting medium-sized muscular aeries, typically involving the aeries of the kidneys and other internal organs but generally sparing the lungs' circulation. Polyaeritis nodosa may be present in infants. In polyaeritis nodosa, small aneurysms are strung like the beads of a rosary, therefore making "rosary sign" an impoant diagnostic feature of the vasculitis. PAN is associated with infection by the hepatitis B or hepatitis Cvirus