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Massive proteinuria associated with chronic pyelonephritis is reported in five patients. Two of them were known to have vesicoureteral reflux, whereas three had minor predisposing factors only. None of the patients were in severe renal failure or suffered from severe hypertension at the time of massive proteinuria. Results of histological examinations were compatible with a diagnosis of chronic pyelonephritis. Electron microscopy and immunological studies did not show any primary glomerular lesions.
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