<prompt> RPGNrapidly progressive glomerulonephritis caused by-FSGSWegeners granulomatosisGood pasteurs syndromePAN  <response>: 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 