Histologic subclassification of IgA nephropathy: a clinicopathologic study of 244 cases

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
M Haas

Abstract

IgA nephropathy (IgAN) may present with a wide variety of histologic patterns on renal biopsy, ranging from a minimal lesion to a diffuse proliferative glomerulonephritis (GN). The histologic features of 244 cases of IgAN (not including Schönlein-Hanoch nephritis) diagnosed between 1980 and 1994 were reviewed, and each case was subclassified using the following, relatively simple histologic classification scheme: subclass I (39 cases): minimal or no mesangial hypercellularity, without glomerular sclerosis; subclass II (18 cases): focal and segmental glomerular sclerosis without active cellular proliferation; subclass III (110 cases): focal proliferative GN; and subclass IV (42 cases): diffuse proliferative GN; and subclass V (35 cases): any biopsy showing > or = 40% globally sclerotic glomeruli and/or > or = 40% estimated cortical tubular atrophy or loss. Subsequent analysis of renal survival in 109 patients who underwent biopsy before or during 1992 for whom such data were available showed a strong, statistically significant correlation between histologic subclass and renal survival, with an order I, II (greatest survival) > III > IV, V. Crescents were a significant negative prognostic indicator for renal survival in subclass ...Continue Reading

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