Overview of Vasculitis By Alexandra Villa-Forte, MD, MPH, Cleveland Clinic Reviewed / Revised Jun 2022 | Modified Sep 2022 View Patient Education Etiology Pathophysiology Classification Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Livedo Reticularis Cutaneous Vasculitis (Lower... Histologic Clues to Diagnosis... Classification of Vasculitic... Vasculitis is inflammation of blood vessels, often with ischemia, necrosis, and organ inflammation.