Varicocele embolization is a “minimally invasive treatment for varicocele that is performed by an interventional radiologist. This involves passing a small wire through a peripheral vein and into the abdominal veins that drain the testes. Through a small flexible catheter, the doctor can obstruct the veins so that the increased pressures from the abdomen are no longer transmitted to the testicles. The testicles then drain through smaller collateral veins.”

Conventional information can be found here or here .

But these websites don’t present the real risks involved with such a procedure, saying only that “minor complications such as bruising at the catheter site, nausea or low-grade backache may occur, but are uncommon.”