Necrotic crescentic glomerulonephritis and IGA nephropathy: Lee-Haas classification revisited.

Capillary necrosis is frequently encountered in most forms of proliferative glomerulonephritis, and varies in severity from only occasional finding to severe form of glomerular vasculitis. We report a patient who presented with features of acute glomerulonephritis. Kidney biopsy showed crescents in 30% of the glomeruli, diffuse mesangial expansion and hypercellularity with IgA deposits on immunofluorescence. The relevance of the Lee-Haas classification is discussed in relation to assessing prognosis.