renal vein

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renal vein

A large vein that drains blood from the kidney and empties into the inferior vena cava; the renal veins lie on top of (anterior to) the renal arteries. To reach the vena cava, the left renal vein passes over the aorta and is three times as long as the right renal vein. Tributaries of the left renal vein include the left testicular or ovarian vein and the left adrenal vein.
See also: vein
References in periodicals archive ?
The mechanism for producing hematuria is thought to be due to increased left renal vein pressure, resulting in small venous ruptures into the collecting system or between dilated venous sinuses and adjacent renal calyces.
Other etiologic hypotheses of nutcracker syndrome include posterior renal ptosis with resultant stretching of the left renal vein over the aorta, and abnormal branching of the superior mesenteric artery from the aorta.
Although it can be invasive and uncomfortable for the patient, renal venography combined with measurement of the pressure gradient between the left renal vein and the IVC is the gold standard for demonstrating renal vein hypertension.
Doppler ultrasound measurements of the anterior-posterior (A-P) diameter and peak velocities of the left renal vein may be helpful in diagnosing nutcracker syndrome.
CT and CT angiography are other noninvasive modalities that can demonstrate compression of the left renal vein in the aortomesenteric angle and collateral veins.
A confounding factor is that distended left renal vein can be a normal variant without collateral veins and with normal pressure gradient.
Conservative management with routine urinalysis is proposed for mild hematuria, since the development of collateral veins may resolve the hypertension in the left renal vein and alleviate symptoms.
Further imaging to characterize the mass (arrow), ultrasound with flow into and out of kidney closely associated with mass (A) and magnetic resonance imaging identifying a mass in hilum without further clarification as to whether lesion is intrinsic or extrinsic to the left renal vein (B).
2) Clues to duplication of the IVC on cavography include lack of visualization of the left iliac inflow and larger-than-expected left renal vein inflow.
Pathology demonstrated the mass as clear cell RCC in the upper pole of the left kidney with extension into the left renal vein.
1: The computed tomography showing the silicon catheter traversing the renal parenchyma, passing through the left renal vein and ending, with the balloon inflated, in the inferior vena cava.