RPGN(rapidly progressive glomerulonephritis) caused by-

Granulomatosis With Polyangiitis Previously called Wegener granulomatosis, granulomatosis with polyangiitis (GPA) is a necrotizing vasculitis characterized by a triad of the following: * Necrotizing granulomas of the upper-respiratory tract (ear, nose, sinuses, throat) or the lower-respiratory-tract (lung) or both * Necrotizing or granulomatous vasculitis affecting small- to medium-sized vessels (e.g., capillaries, venules, aerioles, and aeries), most prominently the lungs and upper airways but other sites as well * Focal necrotizing, often crescentic, glomerulonephritis Ref: ROBBINS BASIC PATHOLOGY 10th ed Pg no: 388