OverviewPolyarteritis nodosa, seen here on a lower extremity, produces painful, erythematous nodules. Arteries in the deep dermis and upper fat show neutrophilic infiltration.
Update Date 8/3/2014
Updated by: Gordon A. Starkebaum, MD, Professor of Medicine, Division of Rheumatology, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.