Poly arteritis nodosa does not involve
Polyarteritis nodosa (PAN) is a systemic vasculitis of small or medium sized muscular arteries, typically involving renal and visceral vessels but sparing the pulmonary circulation.      
P  A  N -----
* Pulmonary  artery not involved.
*P ANCA -negative
Pulmonary artery
Bronchial artery
Renal artery
Cerebral artery