Pauci-immune glomerulonephritis

A rare small vessel vasculitis associated with rapidly progressive glomerulonephritis (GN) and clinically characterized by renal manifestations such as urinary abnormalities (hematuria and/or proteinuria) and hypertension leading to renal failure within days or weeks, and distinguished by the absence of immune deposits on immunofluorescent microscopy. The disease can occur as a renal-limited disease or as a component of systemic necrotizing small-vessel vasculitis.