Varicocele Embolization

Introduction

If you have been diagnosed with a varicocele and your doctor has discussed treatment, varicocele embolization is one of the options you may be weighing. It is a minimally invasive procedure performed by an interventional radiologist — a doctor who uses imaging guidance to treat conditions through small punctures in the skin rather than open surgery.

This article is written for adults (and parents of adolescents) who already know they have a varicocele and are now planning the next step. It explains what the procedure involves, who it tends to suit, how it compares with surgical alternatives, what recovery looks like, and what outcomes you can reasonably expect. The aim is to help you have a more informed conversation with your treating doctors, not to make the decision for you.

What Is Varicocele Embolization?

A varicocele is an enlargement of the veins inside the scrotum, similar to varicose veins in the leg. These veins drain blood from the testicles. When valves inside them do not work properly, blood pools and the veins swell. Most varicoceles occur on the left side because of how the left testicular vein joins the larger left renal vein at a sharper angle.

Varicocele embolization (sometimes called percutaneous embolization or transcatheter embolization of the testicular vein) is a procedure that blocks the abnormal veins from the inside. Instead of making a cut in the groin or scrotum, the interventional radiologist threads a very thin tube called a catheter through a vein — usually in the neck or groin — and guides it under live X-ray imaging into the affected testicular vein. Once positioned, the doctor seals the vein using small metal coils, a sclerosant (a liquid that closes veins), a vascular plug, or a combination. Blood is then naturally redirected through healthier veins, and the swollen varicocele gradually shrinks.

The procedure is typically done under local anaesthesia with light sedation, takes one to two hours, and most people go home the same day.

Why Is Varicocele Embolization Performed?

Many varicoceles are found on routine examination and never cause problems. Treatment is generally considered when a varicocele is associated with one or more of the following:

• Pain or discomfort in the scrotum — often a dull, dragging ache that worsens with standing, exercise, or at the end of the day
• Visible or palpable swelling that is bothersome or growing
• Male-factor infertility with abnormal semen parameters in a couple trying to conceive
• Testicular size difference (a smaller affected testicle), particularly in adolescents
• Recurrence after previous surgical varicocelectomy — embolization is often used in this situation because it avoids operating through previously dissected tissue

The American Urological Association (AUA) and the American Society for Reproductive Medicine (ASRM), in their joint guidance, describe varicocele repair as a reasonable option for men in infertile couples when a clinical varicocele is present along with abnormal semen analysis. European Association of Urology (EAU) guidance is broadly similar. Embolization and surgical varicocelectomy are both recognised treatment options, with the choice influenced by patient preference, anatomy, prior surgery, and local expertise.

Who Is a Candidate?

Varicocele embolization is generally suitable for adult men and many adolescents with a confirmed varicocele who meet the indications above. Factors that may make embolization particularly attractive include:

• A preference to avoid a surgical incision and general anaesthesia
• Varicoceles on both sides (bilateral), which can often be treated in a single session
• A varicocele that has come back after previous surgery
• Higher anaesthetic risk for surgery
• A wish to return quickly to work or physical activity

Embolization may be less suitable, or require more careful planning, in the following situations:

• Severe contrast allergy — the procedure uses iodinated contrast dye; alternatives or pre-medication may be needed
• Significant kidney impairment — contrast use must be carefully balanced
• Pregnancy in a partner is not a barrier, but radiation exposure is a consideration for the patient themselves; shielding is standard
• Unusual venous anatomy — in some patients the testicular vein takes an unusual course that is harder to catheterise; the interventional radiologist may discuss this after reviewing imaging
• Bleeding disorders or anticoagulation — usually manageable with planning

Whether embolization is appropriate for you is a clinical decision made together with your urologist and interventional radiologist, based on your symptoms, imaging, semen analysis (if relevant), and personal preferences.

Alternatives to Varicocele Embolization

Embolization is one route to treating a varicocele. The principal alternative is surgical varicocelectomy, which involves tying off the affected veins through a small incision. Several surgical approaches exist:

Open (inguinal or subinguinal) varicocelectomy

The surgeon makes a small incision near the groin and identifies and ties off the dilated veins. The subinguinal approach (just below the groin crease) avoids cutting through the abdominal wall muscle.

Microsurgical varicocelectomy

This is an open subinguinal operation performed with the help of an operating microscope. Magnification allows the surgeon to more precisely identify the testicular artery, lymphatic vessels, and small veins. Major societies generally describe microsurgical varicocelectomy as having the lowest reported recurrence and complication rates among surgical options, particularly hydrocele formation (fluid collection around the testicle).

Laparoscopic varicocelectomy

Performed through small abdominal incisions using a camera and instruments. It addresses the veins higher up, near where they enter the larger abdominal veins. It is used less commonly now because microsurgical approaches have generally shown better outcomes.

Watchful waiting

If a varicocele is not causing symptoms, fertility concerns, or testicular size difference, observation is reasonable. Many men with varicoceles never need treatment.

Assisted reproduction

For couples whose primary concern is fertility, assisted reproductive techniques (such as intrauterine insemination or in vitro fertilization) may be discussed in parallel with or instead of varicocele treatment, depending on the broader fertility picture. This is a conversation for the couple with a fertility specialist.

How embolization and microsurgical varicocelectomy compare is an ongoing area of clinical interest. Studies suggest broadly similar improvements in semen parameters and pregnancy outcomes, with embolization offering faster recovery and avoiding a scrotal or groin incision, while microsurgery offers a very low recurrence rate. The right choice depends on individual circumstances and the experience available locally.

Preparing for Varicocele Embolization

Preparation usually begins in the days to weeks before the procedure. Your team will tailor the steps to you, but typical elements include:

Tests and imaging

• Scrotal ultrasound with Doppler to confirm the varicocele and assess its severity
• Blood tests including kidney function (since iodinated contrast is used) and clotting
• Semen analysis if fertility is a reason for treatment — usually two samples on separate occasions
• Pregnancy considerations for a partner — not a contraindication, but timing of conception attempts may be discussed

Medication review

Tell your team about all medications and supplements you take. Blood thinners (such as warfarin, clopidogrel, or direct oral anticoagulants), aspirin, and some herbal supplements may need to be paused before the procedure. Do not stop prescribed medications on your own — your doctors will give specific instructions.

Fasting

You will usually be asked not to eat for several hours before the procedure. Sips of water for essential medications are often allowed. You will receive specific timing instructions.

Practical arrangements

• Arrange transport home, as sedation makes driving unsafe for the rest of the day
• Bring loose, comfortable clothing
• Plan for a quiet day at home afterwards
• If the access site will be in the neck, plan for a high-collared or loose-necked top

What Happens During Varicocele Embolization

The procedure takes place in an interventional radiology suite, which looks similar to an operating theatre but has live X-ray equipment overhead.

Setting up

You will lie flat on a table. A nurse will place a small drip in a vein and attach monitors for heart rate, blood pressure, and oxygen levels. You may be given a sedative through the drip to help you relax. Most patients are awake but drowsy and comfortable; general anaesthesia is rarely needed.

Access

The interventional radiologist cleans the skin and numbs a small area with local anaesthetic. The puncture is typically made in:

• The right internal jugular vein in the side of the neck, or
• The right common femoral vein in the groin

Both routes lead through the same venous system to the testicular vein. Choice depends on operator preference and your anatomy. You should feel only the pinprick and pressure of the local anaesthetic.

Catheter navigation

Venography

A more detailed contrast study (called a venogram) confirms the abnormal flow and maps the veins. This is important because the testicular vein often has several branches that all need to be addressed to reduce the chance of recurrence.

Embolization

Once the anatomy is mapped, the radiologist closes the abnormal vein. Materials commonly used include:

• Metallic coils — small wire coils that fill the vein and promote clotting
• Sclerosant liquids or foams — agents that irritate and seal the vein wall
• Vascular plugs — small mesh devices designed to block flow

Often a combination is used, particularly when there are multiple branches. If a varicocele is present on both sides, both can usually be treated in the same session by repositioning the catheter.

Finishing up

A final contrast injection confirms the affected veins are closed. The catheter and sheath are removed and gentle pressure is held over the puncture site for several minutes. No stitches are usually needed; a small dressing is applied. The whole procedure typically lasts one to two hours.

Recovery and Healing

The first few hours

You will rest in a recovery area for two to four hours. Staff will check the puncture site and your vital signs. If the access was in the groin, you may be asked to keep that leg straight for a period. Most patients are discharged the same day.

The first week

• Mild ache or dragging sensation in the scrotum and lower back is common and reflects the treated veins clotting off
• Bruising at the puncture site is normal
• Simple pain relief such as paracetamol is usually enough; your team may suggest a short course of anti-inflammatory medication
• Most people return to office-type work within one to three days
• Avoid heavy lifting and strenuous exercise for around a week

Weeks two to six

• The varicocele itself shrinks gradually over weeks to a few months as the treated veins become scar tissue
• Most physical activity can be resumed by two weeks
• A small number of patients experience a brief inflammatory reaction called post-embolization syndrome — low-grade fever, mild flank or scrotal discomfort, and feeling unwell for a few days. It usually settles on its own.

Follow-up

You will typically have a follow-up visit a few weeks after the procedure. If fertility was the reason for treatment, semen analysis is usually repeated three to six months later, since sperm production cycles take around three months. Improvements in semen parameters, when they occur, tend to appear over this window. A follow-up scrotal ultrasound may be arranged to confirm the varicocele has resolved.

Risks and Complications

Varicocele embolization is generally considered a safe procedure with a low complication rate, but no procedure is risk-free. Possible issues include:

Common and usually minor

• Bruising or soreness at the puncture site
• Mild scrotal or flank discomfort for a few days
• Post-embolization syndrome (mild fever, fatigue)
• Transient nausea from contrast or sedation

Less common

• Recurrence or persistence of the varicocele — reported recurrence rates vary across studies, often in a single-digit to low double-digit percentage range. Recurrence is sometimes due to small accessory veins that were not visible at the time of the procedure.
• Coil migration — rarely, an embolization coil can move from its intended position. Operators take careful steps to prevent this.
• Contrast reaction — allergic reactions to iodinated contrast range from mild rash to, very rarely, more serious reactions
• Vascular injury — injury to the vein during catheter manipulation is uncommon
• Radiation exposure — a small dose of X-ray radiation is used; modern equipment and techniques keep this as low as reasonably achievable, and the gonads are shielded where possible

Rare

• Infection at the puncture site
• Significant bleeding requiring intervention
• Deep vein thrombosis
• Hydrocele (fluid collection around the testicle) — less common after embolization than after surgical varicocelectomy
• Testicular atrophy — very rare with embolization because the testicular artery is not at risk; this is one of the recognised advantages of the approach

You should contact your team if you develop a high fever, severe scrotal pain or swelling, increasing redness or discharge from the puncture site, or sudden chest pain or breathlessness after the procedure.

Outcomes and Effectiveness

Outcomes after varicocele embolization are reported in two main ways: technical success and clinical success.

Technical success — whether the operator was able to access and close the abnormal veins — is high in experienced hands, generally reported in the high 90s percent range. In a small number of cases, unusual anatomy prevents complete embolization on the first attempt.

Clinical success includes improvement in symptoms, reduction in varicocele size, and, where relevant, improvement in semen parameters or pregnancy outcomes:

• Symptom relief (for pain or dragging) is reported in the majority of treated patients
• Semen parameters — sperm concentration, motility, and morphology — improve in a meaningful proportion of men, typically assessed at three to six months
• Pregnancy outcomes — spontaneous pregnancy rates after varicocele treatment in infertile couples have been reported across a wide range in different studies; whether to pursue varicocele treatment versus other fertility approaches is a conversation for the couple with their specialists

Studies comparing embolization with microsurgical varicocelectomy have generally shown similar improvements in semen parameters and pregnancy rates, with embolization typically offering shorter recovery and microsurgery typically offering somewhat lower recurrence. Major societies do not strongly favour one approach over the other for all patients; the choice is individualised.

Life After Varicocele Embolization

For most men, life after a successful embolization simply returns to normal — the dull ache fades, the visible swelling shrinks over weeks to months, and follow-up confirms the varicocele has resolved. A few practical points to keep in mind:

• Activity — once the early recovery period is past, there are no long-term restrictions on exercise, lifting, sexual activity, or sport
• Sexual function — embolization does not affect erectile function or ejaculation
• Testicular health — the testicles continue to produce hormones and sperm normally; many men with prior fertility concerns see semen parameters improve
• Future imaging — the metal coils used in embolization are generally safe with MRI scans, but always mention them when booking an MRI so the radiographer can confirm
• Recurrence awareness — if dull aching or visible swelling returns, mention it at follow-up; recurrence can sometimes be treated with a second embolization or with surgery

Varicocele Embolization in Adolescents

Varicoceles often first appear during puberty, and management in adolescents has some distinct considerations. The reader of this section is usually a parent.

Treatment is generally considered in adolescents when there is:

• A significant size difference between the affected testicle and the other side (often defined as 20 percent or more on ultrasound)
• Persistent pain
• A very large (grade 3) varicocele
• Abnormal semen analysis in older adolescents

Many adolescents with small, asymptomatic varicoceles are followed with periodic examination and ultrasound rather than treated immediately. The reasoning is that not all varicoceles cause future fertility problems, and treatment carries its own small risks.

When treatment is chosen, both embolization and microsurgical varicocelectomy are used in adolescents. Embolization avoids general anaesthesia and a scrotal incision, which some families and adolescents prefer. The approach is technically similar to that used in adults, though the radiologist takes additional care with radiation dose. Whether embolization or surgery is the better option for a particular adolescent is a discussion involving the paediatric urologist, the interventional radiologist, the adolescent, and the family.

Frequently Asked Questions

Will I be awake during the procedure?

Most patients are awake but lightly sedated. You will feel relaxed and may doze, but general anaesthesia is rarely needed. Local anaesthetic is used at the puncture site so you do not feel the catheter being placed.

Is varicocele embolization painful?

The procedure itself is generally not painful beyond the pinprick of the local anaesthetic. Some patients feel a warm sensation when contrast dye is injected, or a brief dragging feeling when the vein is being closed. Afterwards, a dull scrotal or flank ache for a few days is common but usually mild.

How soon can I return to work?

Most people with office-type work return within one to three days. Heavy physical work or strenuous exercise is usually paused for around a week.

How long before I know if it has worked?

If your main concern was pain, improvement often becomes apparent over the first few weeks as the treated veins clot down. Visible shrinking of the varicocele takes weeks to a few months. If the goal was fertility-related, semen analysis is typically repeated at three to six months, since sperm production cycles take around three months.

Can both sides be treated at once?

Yes. When varicoceles are present on both sides, both can usually be treated in the same session by repositioning the catheter.

Will the metal coils set off airport security or affect MRI scans?

The coils are very small and do not typically trigger airport security scanners. Most embolization coils are MRI-conditional, meaning MRI scans can be performed safely with appropriate protocols. Always tell the radiographer before any MRI that you have had embolization.

What happens if the varicocele comes back?

Recurrence is uncommon but possible, often due to small accessory veins that were not visible during the first procedure. If it happens, options include a repeat embolization targeting the previously unseen veins, or a surgical approach. Your interventional radiologist and urologist will discuss what makes sense in your case.

Does embolization affect testosterone or sexual function?

Embolization does not directly affect testosterone production, erectile function, or ejaculation. The testicular artery, which supplies blood to the testicle, is not touched during the procedure — this is a recognised advantage of the approach.

Is embolization better than surgery?

Neither is universally better. Major societies recognise both as acceptable approaches. Embolization typically offers a shorter recovery and avoids a scrotal or groin incision; microsurgical varicocelectomy typically offers a slightly lower recurrence rate. Studies comparing semen parameter improvement and pregnancy outcomes have generally shown similar results between the two. The right choice depends on your specific situation, local expertise, and your own preferences.

Can a varicocele come back after surgery and then be treated with embolization?

Yes. Embolization is often used to treat varicoceles that have recurred after surgical varicocelectomy, because it avoids operating again through previously dissected tissue.

Conclusion

Varicocele embolization is a well-established, minimally invasive way to treat an enlarged vein in the scrotum. For patients whose main goals are symptom relief, addressing fertility-related semen findings, or avoiding a surgical incision — and for those whose varicocele has come back after surgery — it is one of the recognised options alongside microsurgical and other forms of varicocelectomy. Recovery is generally quick, and serious complications are uncommon.

Whether embolization is the right approach for you, or whether a surgical option fits your situation better, is a decision best made together with your urologist and interventional radiologist, taking into account your symptoms, imaging, fertility goals, anatomy, and personal preferences. Understanding the procedure in advance is a useful first step in that conversation.