Nephritis in children and young adults with systemic lupus erythematosus and normal urinary sediment.

One male and seven female patients (aged 6 to 26 years) with systemic lupus erythematosus (SLE), normal urinalyses, and normal biochemical tests of renal function, had renal biopsies to determine if significant nephropathy existed. Several had active SLE in other body systems at the time, either clinically or as evidenced by low serum complement and high native DNA antibody levels. The renal biopsy specimens were studied by light, fluorescent antibody, and electron microscopy. Three patients had a generalized segmental, two had a focal segmental, and one had a generalized diffuse proliferative glomerulonephritis. In addition, one patient had minimal glomerular findings with interstitial inflammation. All eight patients were found to have moderate immune complex deposition by immunofluorescence and/or electron microscopy studies. The absence of clinical renal involvement in patients with SLE does not preclude ongoing active and "silent" glomerular damage with moderately severe proliferative changes.