text: <unk>  polyangiitis must be differentiated from other diseases that cause purpura, alveolar hemorrhage, fever, arthralgia, myalgia, necrotizing extra-capillary glomerulonephritis, such as Granulomatosis with polyangiitis and Eosinophilic granulomatosis with polynagiitis.
option_0: Microscopic polyangiitis differential diagnosis
option_1: Granulomatosis with polyangiitis differential diagnosis
option_2: Goodpasture syndrome differential diagnosis
option_3: Rapidly progressive glomerulonephritis differential diagnosis
option_4: Granulomatosis with polyangiitis diagnostic study of choice
option_5: Focal segmental glomerulosclerosis differential diagnosis
option_6: Uveitis differential diagnosis
option_7: Hemosiderosis differential diagnosis