What is varicocele embolization?

A varicocele is essentially a varicose vein in the scrotum. The valves in the spermatic (gonadal) vein fail, blood pools backward, and the surrounding pampiniform plexus enlarges. Over time this can cause aching, heaviness, raised scrotal temperature, and — for some men — reduced sperm count and quality. About 90% of varicoceles are left-sided, with up to 30% being bilateral.

Embolization treats the problem from inside the vein. Through a small needle puncture in a vein in the neck or arm, an interventional radiologist guides a thin catheter to the faulty spermatic vein and seals it permanently using small platinum coils, sclerosant, or both. Blood reroutes through healthy collateral veins and the varicocele decompresses. The technique has been performed since the 1980s and is endorsed in the American Urological Association / ASRM Best Practice Statement on varicocele management.

Compared with surgical varicocelectomy, embolization avoids any incision in the scrotum or groin, requires no general or spinal anesthesia, has no stitches, and lets most men return to work within 1–2 days instead of 1–2 weeks. When technically successful, effectiveness is comparable to surgery for both pain relief and fertility outcomes (Cassidy et al., J Vasc Interv Radiol, 2012).

When varicocele embolization is appropriate

Many varicoceles cause no symptoms and don’t require treatment. Embolization is designed for varicoceles causing real problems:

• Scrotal pain or heaviness — a dull, dragging ache that worsens after standing or exercise
• Visible scrotal swelling — often described as “a bag of worms,” more obvious when standing
• Male-factor infertility with abnormal semen analysis — varicoceles are present in 35–40% of men with primary infertility and up to 80% with secondary infertility
• Recurrence after prior varicocelectomy — embolization is the preferred salvage option
• Adolescent varicocele with testicular growth retardation — covered as medically necessary by most insurers

How the procedure works

Varicocele embolization is performed in an outpatient procedure suite under local anesthesia and light sedation — not general anesthesia. After numbing the skin, a small catheter is inserted through a vein in the neck or arm and guided down to the spermatic vein under live X-ray. Once positioned, the abnormal vein is permanently sealed with platinum coils and/or a sclerosant, and any collateral veins that could fuel a recurrence are addressed at the same time. The whole procedure typically takes under an hour.

What to expect

Varicocele embolization is a same-day outpatient procedure with one of the shortest recoveries in interventional radiology.

Outcomes: what the data show

Varicocele embolization has been studied for over four decades, with consistent results across published series:

• Technical success: ~96% for left-sided varicoceles in modern series
• Clinical success (resolution of symptoms): >93%
• Pain relief: reported by ~90% of men treated for chronic scrotal pain
• Fertility improvement: in a 15-year study of 225 patients, ~51% of men treated for fertility achieved a live birth (Makris et al., CVIR Endovascular, 2025); semen parameters typically improve over 3–6 months
• Recurrence: ~4–10%, comparable to microsurgical varicocelectomy
• Complications: serious complications are rare; the most common minor issues are bruising and transient phlebitis

Why an interventional radiologist?

Varicocele embolization should be performed by an interventional radiologist. The procedure depends on image-guided precision: navigating a sub-millimeter catheter into the gonadal vein, identifying every collateral that could feed a recurrence, and choosing the right combination of coils and sclerosant. That fellowship-trained expertise is what separates a 96% success rate from a recurrence.