Vasovasostomy vs Vasoepididymostomy: Which Reversal Do You Need?

Vasovasostomy (VV) rejoins the cut ends of the vas deferens, the standard reversal procedure. Vasoepididymostomy (VE) bypasses a blockage by attaching the vas deferens directly to a tubule in the epididymis. VV is what most men think of when they hear “vasectomy reversal.” VE is the more technically demanding repair done when VV won’t work, typically because back-pressure from the original vasectomy has caused a secondary blowout in the epididymis. The single most important thing about choosing a reversal surgeon: pick one trained to do either, because the call is made on the operating table, not in the consult room.

The short version

Vasovasostomy (VV): vas-to-vas. Standard reversal. Used when intraoperative fluid from the upstream end of the vas contains sperm or a clear/copious fluid signature suggesting a patent epididymis.
Vasoepididymostomy (VE): vas-to-epididymis. Used when no sperm are seen in the upstream fluid, signaling that an obstruction has developed in the epididymis from chronic back-pressure.
VV patency runs around 90 percent or higher in modern microsurgical hands. VE patency runs lower, often 60 to 70 percent (Cleveland Clinic: Vasectomy Reversal).
The probability of needing VE on at least one side rises sharply with time since vasectomy. Belker et al. (1991) Vasovasostomy Study Group documented the pattern: patency drops to 71 percent at 15+ years when only VV is available, and modern microsurgery preserves much of that lost ground by offering VE when needed.
A surgeon who can only perform VV will close and walk away when VE is what was needed. Ask explicitly whether your surgeon is fellowship-trained in microsurgical VE.

What vasovasostomy actually is

A vasovasostomy is a microsurgical reconnection of the vas deferens. The surgeon exposes both severed ends of the vas (the abdominal end going up toward the prostate, and the testicular end coming up from the epididymis), trims them back to healthy tissue, and sutures them together under an operating microscope. Most modern microsurgeons use a two-layer closure: an inner layer of very fine sutures (typically 10-0 nylon) reapproximating the mucosal channel, and an outer layer of slightly heavier sutures (9-0) reapproximating the muscular wall. The microscope matters. The vas inner channel is roughly the diameter of a pencil tip, and aligning it precisely is what separates a high-patency reversal from a low one.

The procedure runs roughly 2 to 4 hours when only VV is needed on both sides. Anesthesia is usually general or deep sedation. The skin incision is small, one per side or sometimes a single midline incision, and recovery takes 1 to 2 weeks off work.

The Mayo Clinic patient page on vasectomy reversal covers the basics if you want a clean overview.

What vasoepididymostomy actually is

A vasoepididymostomy bypasses the vas-to-vas connection and goes one step deeper. The surgeon attaches the abdominal end of the vas directly to a specific tubule in the epididymis, the coiled tube where sperm mature and are stored between the testicle and the vas.

The epididymis tubule is much smaller than the vas. It is roughly 0.2 to 0.3 mm in diameter, fine enough that the procedure requires high-magnification microsurgery and ultra-fine sutures. The surgeon also has to pick the right tubule. Going too high on the epididymis (closer to the testicle) gets you immature sperm that won’t fertilize an egg. Going too low risks attaching to a tubule above an obstruction, which produces a patent connection that still doesn’t carry sperm. This is the technical challenge that separates VE from VV.

VE takes longer per side, often adding 1 to 2 hours to the operative time. Skin recovery is similar. The patency rate is lower, typically 60 to 70 percent in published microsurgical series, because the connection is smaller, more delicate, and more prone to scarring shut.

When VV works and when VE is needed

The decision happens during surgery, not before. The surgeon opens the upstream (testicular) end of the vas, expresses a small amount of fluid, and looks at it under the microscope. What he or she sees determines the procedure:

Clear or cloudy fluid with sperm visible: the epididymis is patent. VV will work. The two ends of the vas are sewn together.
Creamy, toothpaste-like fluid with no sperm: the epididymis is obstructed. A back-pressure blowout has occurred somewhere upstream. VV alone will produce a patent vas with no sperm in the ejaculate. VE is needed to bypass the obstruction.
Watery clear fluid with no sperm: intermediate finding. Some surgeons proceed with VV; others perform VE. Surgeon judgment.

You can’t know in the consult room which of these you’ll have. You can predict probability, though. Time since vasectomy is the strongest predictor: the longer the interval, the more back-pressure the epididymis has been carrying, and the more likely a blowout has occurred. By 10 to 15 years out, the probability of needing VE on at least one side is meaningful. By 15+ years out it is common.

This is why the standard recommendation among reversal microsurgeons is: pick a surgeon trained to do either VV or VE on either side, depending on what’s found. A surgeon who only performs VV either won’t operate on you (if your odds of needing VE are high) or will perform VV regardless of intraoperative findings, leaving you with a patent but sperm-free vas and the need for a second surgery elsewhere.

Outcomes side by side

Both procedures count as “success” in the same way: sperm in the ejaculate (patency) and ideally a pregnancy. The probabilities differ.

Procedure	Typical patency	Typical pregnancy	Notes
Vasovasostomy (VV)	90% or higher in modern series	Varies by partner age and other factors, often 50–70%	Standard reversal. Used when upstream fluid has sperm.
Vasoepididymostomy (VE)	60–70%	Lower than VV, often 30–50%	Used when epididymis is obstructed. Higher technical difficulty.

The pregnancy numbers depend heavily on factors that aren’t about the man at all, primarily female partner age and fertility, which is why we have a separate article on the difference between patency and pregnancy rates. Patency is the surgical outcome the surgeon controls. Pregnancy is downstream of that.

The Belker et al. (1991) Vasovasostomy Study Group data is the foundational reference, with patency dropping with longer vasectomy intervals. Modern microsurgical series report better outcomes than the Belker numbers, especially at longer intervals, largely because of widespread VE availability.

What this means for choosing a surgeon

A general urologist who occasionally performs reversals will almost always be a VV-only surgeon. There is nothing wrong with that, if your situation is straightforward (vasectomy under 3 years ago, healthy partner, no history of trauma or infection) and the surgeon openly tells you that VE isn’t in their skillset.

For most other situations, particularly any vasectomy more than 5 to 7 years old, the right surgeon is a fellowship-trained microsurgeon who performs both VV and VE in volume. There are roughly 50 to 100 surgeons in the US who fit this description, and they’re concentrated at academic medical centers and a handful of dedicated reversal practices. They charge more (often $10,000 to $15,000 cash). The case for paying it is that they don’t close and walk away when VE turns out to be what was needed.

Specific questions to ask in a consult:

Are you fellowship-trained in male infertility microsurgery?
How many reversals do you perform per year, and what percentage involve vasoepididymostomy?
What are your published or tracked patency rates for VV and VE?
If intraoperative findings suggest I need VE on one or both sides, what is your plan?
Do you assess the upstream fluid intraoperatively before deciding the procedure?

A confident answer to these is a green flag. Vague answers are not.

FAQ

Can a surgeon decide VV vs VE before surgery?

No, not reliably. There are probabilistic signs (time since vasectomy, history of inflammation or trauma), but the actual call requires examining the intraoperative fluid under a microscope. Any surgeon who tells you definitively before surgery is either oversimplifying or hasn’t worked through the data with you.

What happens if VV is done when VE was needed?

The result is a technically patent vas with no sperm in the ejaculate, since the obstruction sits upstream of the repair. A semen analysis 3 to 6 months out will show azoospermia. The next step is usually a redo reversal, this time with VE, by a surgeon who can perform it.

Why does VE have a lower patency rate?

The connection is smaller and more delicate. The epididymis tubule is a fraction of a millimeter wide. Even with perfect microsurgery, the chance of post-operative scarring closing the connection is meaningfully higher than for vas-to-vas. The trade-off is that VE is the only option when the epididymis is obstructed; if the alternative is no sperm at all, a 60 to 70 percent chance is worth it.

Is VE recovery longer than VV?

Operative time is longer, but post-op recovery is similar. Plan on 1 to 2 weeks off work either way. Activity restrictions (no heavy lifting, no sex) typically run 3 to 4 weeks. The internal healing is what determines when sperm appear in the ejaculate, and that is months out, not weeks.

How long until I know if it worked?

The first post-reversal semen analysis is typically at 2 to 3 months. Patency can appear earlier or later. If sperm are not yet visible, additional analyses are done every few months. Most surgeons give a final patency assessment at 12 to 18 months. After that, if no sperm have appeared, the reversal is considered unsuccessful and you would discuss redo options or IVF with sperm aspiration.

Can a redo reversal work after a failed first attempt?

Yes, in many cases. Redo reversals are technically harder due to scar tissue from the first procedure, and they are typically only undertaken by high-volume microsurgical practices. Patency rates for redos are lower than for first attempts but still meaningful, often 60 to 75 percent for VV redos.

What if one side needs VV and the other needs VE?

Common. A microsurgeon trained in both will perform whatever’s needed on each side independently. Outcomes from the two sides combine: even if one side fails, the other can carry sperm into the ejaculate.