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Rapidly progressive glomerulonephritis (RPGN) is a clinical syndrome developing over days or weeks characterized by crescentic glomerulonephritis on histopathology of the kidney. The prognosis is poor if not recognized early and if an appropriate treatment is not instituted. To optimize patient management, RPGN may be classified based on a) clinical assessment, b) direct immunofluorescence and electron microscopic studies of renal biopsy and c) serum antibody studies. Using the above criteria, RPGN may be classified into a) immune complex mediated disease characterized by the presence of ant
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