text: <unk>  <unk>  is the formation of a clot or thrombus obstructing the<unk> <unk> . Rayer was the first to describe<unk>  of<unk> <unk>  in nephrotic patients during postpartum. Based on the onset of symptoms<unk>  can be classified into acute and chronic.
option_0: Renal vein thrombosis
option_1: Pyelonephritis
option_2: Pyonephrosis
option_3: Kidney abscess
option_4: Hydronephrosis
option_5: Glomerulonephrosis
option_6: Glomerulonephritis
option_7: Obstructive uropathy