Left testicular vein

The left testicular vein is the male equivalent of the ovarian vein. Both testicles have veins that join in different locations. The right testicular vein attaches to the inferior vena cava. The left vein drains the left renal vein. The left testicle is bigger than the right one; therefore, the left vein is longer than the right. Because the left vein is longer, it is subject to more difficulties when draining. Poor drainage can lead to problems such as testicular swelling and pain. There are also clinical consequences related to the left vein of the testicle and its connection to the left renal vein; kidney infections and even cancer of the kidney can infiltrate the left testicular vein. This causes the blood to gather, leading to dilated veins in the scrotum. After a discovery of swelling to the left testicle, renal cancer or any other kidney problems should always be ruled out first. Dormant renal cancer often presents itself as a swelling in the left testicle. A swelling associated with renal cancer will not decompress when the patient is lying down; therefore, this condition is easy to rule out.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: Left testicular vein

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