<prompt> Answer this question truthfullyWhat does renal vein thrombosis mean?  <response>: <reason> Malignancy especially renal cell carcinoma is the most common etiology consists ofPrevalence of renal vein thrombosis in nephrotic syndrome is 5 to 60 .Membranous nephropathy is responsible for 20 to 60 of the cases which makes it the most common cause of renal vain thrombosis among nephrotic syndromes. Other etiologies like minimal change disease, membranoproliferative glomerulonephritis, and focal segmental glomerulosclerosis cause 10 to 50 of the cases . 