Mesangial lupus nephritis with associated nephrotic syndrome.

Patients with mesangial proliferative lupus glomerulonephritis (World Health Organization class II) are generally believed to have only mild to moderate proteinuria and normal renal function. However, there have been several reports of patients with mesangial lupus with nephrotic-range proteinuria. In this report, we present two additional cases and review the literature. Of seven reported cases, persistent nephrotic syndrome was observed in four, morphologic transformation occurred in three, and all but one presented with varying degrees of azotemia. These cases reinforce the concept that in systemic lupus erythematosus, laboratory findings may not correlate well with the underlying glomerular lesion, and therefore, the renal biopsy is an essential clinical tool in the approach to lupus nephritis.