<unk>  are a group of heterogeneous diseases that share the etiology in terms of inflammation of the blood vessels (vasculitis) – more specifically the arterioles – with systemic envolvement. Some examples of this group include granulomatosis with polyangiitis, polyarteritis nodosa, Behçet's disease, and HSP.
Systemic vasculitides
Systemic vasculitis
Lupus vasculitis
Livedoid vasculitis
Rheumatoid vasculitis
Takayasu's arteritis
Urticarial vasculitis
Golfer's vasculitis