Slide from a patient with eosinophilic granulomatous polyangiitis (EGPA, formerly known as Churg-Strauss syndrome). A relatively rare ANCA-associated autoimmune disease involving inflammation and necrosis of small to medium-sized blood vessels. Distinctive features of this disease are the occurrence of peripheral eosinophilia and asthma. In this case, the absolute number of eosinophils was .