Vasculitis is defined as an inflammatory process involving blood vessels, and can lead to destruction of thevascular wall and ischemic damage to the organs supplied by these vessels. The lung is commonly affected. A numberof attempts have been made to classify and organize pulmonary vasculitis, but because the clinical manifestationsand pathologic features of the condition overlap considerably, these afforts have failed to achieve a consensus.We classified pulmonary vasculitis as belonging to either the angitiis-granulomatosis group, the diffuse pulmonaryhemorrhage with capillaritis group, or 'other'. Characteristic radiographic and CT findings of the different typesof pulmonary vasculitis are illustrated, with a brief discussion of the respective disease entities.