Gonadal Veins

venae gonadales

The gonadal veins drain the testes and ovaries with important anatomical asymmetry: the right gonadal vein drains directly into the inferior vena cava at an acute angle, while the longer left gonadal vein drains into the left renal vein at a right angle before that vein joins the IVC. This asymmetry makes venous return from the left gonad less efficient and explains the preponderance of left-sided varicocele.

Region: Abdomen

Clinical Relevance

Clinical Notes

Left-sided varicocele (dilated tortuous left pampiniform plexus) occurs predominantly on the left because the left gonadal vein drains into the left renal vein at a right angle, creating relatively higher venous pressure. Varicoceles are associated with male subfertility and testicular pain. Embolisation or surgical ligation of the left gonadal vein treats the varicocele. A new left-sided varicocele in a middle-aged man may indicate renal cell carcinoma occluding the left renal vein (secondary varicocele). The right gonadal vein joins the IVC and rarely produces varicocele.

Pathology

Common Injuries & Conditions

Varicocele

Dilatation of the pampiniform plexus draining via the gonadal vein, predominantly left-sided due to the perpendicular left renal vein drainage, produces a bag of worms sensation in the scrotum, impairs spermatogenesis by elevating testicular temperature, and is treated by embolisation or surgical ligation.

Secondary Varicocele from Renal Tumour

A new right-sided varicocele or a varicocele that fails to empty in the supine position suggests renal cell carcinoma invading the renal vein and occluding gonadal vein drainage, requiring urgent renal ultrasound and CT to exclude malignancy.