[Incidence of proteinuria and nephrotic syndrome in renal vein occlusion caused by a tumor].

A retrospective study was conducted in 13 patients with phlebographically diagnosed tumor-induced renal vein occlusion to evaluate the incidence and extent of proteinuria and/or nephrotic syndrome. In 5 patients minimal proteinuria was found, but in none of the patients were the criteria of nephrotic syndrome fulfilled. These data can be used as additional evidence that renal vein occlusion is not the cause of nephrotic syndrome. They underline the hypothesis that, in cases of nephrotic syndrome associated with renal vein occlusion, the thrombic occlusion of the renal vein is a complication of the excessive renal protein loss and developing hypercoagulability.