In this episode of ACR on Air, we reach the final installment of our vasculitis guideline miniseries. Dr. Hausmann is once again joined by Dr. Sharon Chung, lead author of the 2021 ACR/VF guidelines for managing systemic vasculitis, to discuss Polyarteritis Nodosa (PAN). Dr. Chung weighs in on CTA over MRA for abdominal vascular imaging, and blind biopsy. Dr. Hausmann and Dr. Chung examine various patient scenarios for PAN symptoms and why they would meet the criteria for data testing.