Definition: chronic glomerulonephritis characterized by mesangial cell proliferation, increased lobular separation of glomeruli, thickening of glomerular capillary walls and increased mesangial matrix, and low serum levels of complement; occurs mainly in older children, with a variably slow progressive course, episodes of hematuria or edema, and hypertension. It is classified into three types: type 1, the most common, in which there are subendothelial electron-dense deposits; type 2, dense-deposit disease, in which the lamina densa is greatly thickened by extremely electron-dense material; type 3, in which there are both subendothelial and subepithelial deposits.
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