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The laboratory and pathological findings are reported for 16 children with membranous glomerulonephritis (MGN) associated with hepatitis B virus (HBV) infection and compared with those of 12 children with idiopathic MGN. Serum hepatitis B surface antigen (HBsAg) was found in all children with HBV associated MGN and serum hepatitis B e antigen (HBeAg) in 11 of the 15 examined. Five patients with HBV associated MGN, but none with idiopathic MGN, showed reduced serum C3 values. Otherwise there was no difference in laboratory findings. HBeAg was detected in the glomeruli of all 7 patients with HBV-associated MGN examined but HBsAg was not detected. Of the 14 children with HBV-associated MGN examined by electron microscopy, all but one showed small mesangial deposits and 4 subendothelial deposits, whereas of 9 with idiopathic MGN only 2 showed mesangial deposits and none subendothelial deposits. Thus most of the children with HBV-associated MGN are characterized by some laboratory and pathological features of membrano proliferative glomerulonephritis in addition to those of idiopathic MGN. These observations are consistent with HBV inducing a spectrum of glomerulopathy from typical MGN to typical membranoproliferative glomerulonephritis.
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