legener's granulomatosIs Granulomatous inflammation involving respiratory tract. And necrotizing vasculitis afecting small to medium-size vessels(capillaries, venules, arterioles and arteries). Necrotizing glomerulonephritis is common Triad Upper airway lung nephritisWegener’s granulomatosis Granulomatous inflammation involving respiratory tract. And necrotizing vasculitis affecting small to medium-size vessels(capillaries, venules,arterioles and arteries). Necrotizing glomerulonephritis is common. Triad: Upper airway lung nephritis