[Bilateral renal vein thrombosis extending into the inferior vena cava associated with nephrotic syndrome: a case report].

We present a case of bilateral renal vein thrombosis extending into the inferior vena cava associated with nephrotic syndrome. A 55-year-old Japanese woman who had complained of severe median lumbago for 4 months was referred to our department because of bilateral renal vein thrombosis extending into the inferior vena cava demonstrated on CT. Investigations confirmed the diagnosis of nephrotic syndrome. Although treatments using interventional radiology had been planned, she died suddenly probably owing to pulmonary embolism before the commencement of the treatments.