I have may-thurner syndrome. can this be the cause of a varicocele? do any of the veins in the scrotum require outflow through the common iliac vein?

Related: Pelvic venous congestion and prominent scrotal veins are in the same family of conditions. Collateral veins take up for obstructions. There are more diagnosed and treated iliac obstructions now with newer techniques.

MAY THURNER SYNDROME: MTS is due to compression of the left common iliac vein by the right common iliac artery. It can also occur on the right side but this is rare. The pelvic veins (ovarian/testicular) can be compressed leading to ovarian varices and can also lead to testicular vein engorgement which could lead to a varicocele. This, however, would be a most uncommon occurrence.

See below : MTS is compression of the Left iliac vein between the Right iliac artery and spine associated with edema of the Left leg and increased risk of DVT. The primary venous drainage of the Left testicle is the gonadal vein that drains into the Left renal vein. Left-sided varicoceles normally occur in 10-20% of men. That said, there are case reports of MTS causing, via collaterals, a Left varicocele.