Renal biopsy was performed in 33 children with recurrent haematuria but with no other symptoms of renal disease or urinary-tract lesions. Glomerulonephritis was found in 31 of 33 patients. Light and electron microscopy revealed two groups of pathologic lesions: focal glomerulonephritis in 6 and diffuse postacute proliferative glomerulonephritis in 25 children, The histopathologic changes of the glomerulus were minimal or slight. Only the mesangium was affected by hypereellularity and/or thickening of various degrees. Severe lesions were not found. There was no evidence of reduced renal function or proteinuria. The study indicates that recurrent haematuria is associated with several types of glomerulonephritis. In our eases the prognosis seems to be good. Establishment of a correct diagnosis requires morphological classification by renal biopsy.
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