RESUMO
A retrospective study of 91 primary nephrotic syndrome with renal biopsies from January 1979 to February 1988 was done. The age of onset is divided into three groups, there are 23.0 per cent in age group 1- less than 5 years, 44.0 per cent in group 5-10, and 33.0 per cent in age group greater than 10-15 years. The ratio male to female is 2.1:1. The histopathologic findings are 16.5 per cent MCNS, 12.0 per cent FGN, 33.0 per cent MesPGN, 30.8 per cent MPGN and 7.7 per cent MGN. This study showed that 77.7 per cent of children with primary nephrotic syndrome have the age of onset older than 5 years. The most common histopathologic finding is MesPGN which is reported to be an interchangeable form with MCNS. The result of low incidence of MCNS may be related to the high percentage of MesPGN. The high incidence of MesPGN and MPGN may result from environmental factors such as chronic infection and malnutrition. (MCNS = minimal change nephrotic syndrome, FGN = focal glomerulonephritis, MPGN = membranoproliferative glomerulonephritis, MesPGN = mesangial proliferative glomerulonephritis, MGN = membranous glomerulonephropathy).