[Secondary vasculitides and vasculitis mimics].

Secondary vasculitis is a form of vasculitis for which an underlying disease is known. Diseases associated with secondary vasculitis include infections, drug hypersensitivity, malignancy, rheumatoid arthritis, collagen vascular disease and sarcoidosis. Moreover, there are numerous conditions that can mimic vasculitis clinically, in laboratory testing, radiographically and in histopathology. It is evident that distinguishing primary vasculitis from secondary vasculitis and also vascular inflammation from non-vasculitic disorders (vasculitis mimics) has significant therapeutic implications.