30.1 ICD - 9 446.4 DiseasesDB 2685 eMedicine med/2926 MeSH D015267 Churg-Strauss syndrome (also known as allergic granulomatosis ) is a medium and small vessel autoimmune vasculitis , leading to necrosis . It involves mainly the blood vessels of the lungs (it begins as a severe type of asthma ), gastrointestinal