Do Epididymal Cysts Go Away on Their Own?

Many epididymal cysts do shrink or disappear without treatment, particularly in children and adolescents, where studies report spontaneous resolution in roughly half of cases over one to two years. In adults the picture is less clear-cut, because most adult cysts are discovered incidentally on ultrasound, never cause symptoms, and are simply left alone without long-term tracking. The real question most people are asking when they find a lump near a testicle is a tangle of practical worries: is this dangerous, will it affect fertility, and do I need surgery? The evidence on each of those fronts is more reassuring than you might expect.

What the Pediatric Evidence Shows

Children provide the best natural-history data because pediatric urologists have actually followed cysts over time rather than just removing them. The earliest dedicated study, published in 2004, tracked 20 boys with epididymal cysts and found that the cysts resolved completely in half of them, with an average time to disappearance of about 17 months.¹ Other groups have since reported spontaneous regression in up to 60% of pediatric cases, especially when the cyst is smaller than about 3 centimeters.²

A larger and more recent study followed 75 children and found that about 12% had complete cyst involution and another 6% had measurable shrinkage during follow-up, while only 2% saw their cyst grow and 6% developed additional cysts. None of those children with enlarging or new cysts had symptoms.³ Those resolution numbers are lower than the earlier studies, but the follow-up period and patient selection differed. Another pediatric series found complete involution in 14 children with an average disappearance time of about 11 months, and a decrease in size in 20 more. Only 8 of the children in the whole cohort ended up needing surgery for persistent pain or failure to shrink.⁴

The takeaway from the pediatric literature is that watchful waiting is the standard first step. Many cysts resolve, most of the rest stay stable, and very few cause problems that force a doctor’s hand. That principle shapes how clinicians think about these cysts in adults, too, even though the adult data is thinner.

Do They Resolve in Adults?

There is much less published follow-up data on adult epididymal cysts, for a simple reason: once an ultrasound confirms a benign cyst in a grown man, there is usually no clinical reason to keep scanning. The cyst gets noted in the radiology report, the patient is told it is harmless, and neither party tracks whether it eventually disappears. So we do not have large adult cohort studies showing resolution rates the way we do for children.

What we do know is that epididymal cysts are extremely common in adult men. One ultrasound-based study found them in 71% of the men screened, the highest prevalence ever reported in the literature.⁵ Most of those men had no idea the cysts were there. This is important context: the vast majority of epididymal cysts in adults are incidental findings that never produce symptoms and never require any action at all. Whether they technically “go away” matters less than the fact that they rarely cause trouble.

Clinicians generally advise adult patients with an asymptomatic cyst to leave it alone. If a cyst has been stable for years and is not painful, the reasoning goes, the risks of any procedure outweigh the benefits. Some adult cysts do seem to grow slowly over time, but growth alone is not an indication for intervention unless it brings discomfort or anxiety.

When an Epididymal Cyst Causes Symptoms

Most epididymal cysts are painless. You feel a smooth, round lump at the top or behind the testicle, and that is it. But a minority of cysts do cause a dull ache, a sense of heaviness, or sharper pain during physical activity. The discomfort tends to correlate loosely with cyst size: larger cysts are more likely to press on surrounding structures or get jostled during movement. There is also research into whether even small, subcentimeter cysts can contribute to chronic scrotal pain in some patients, though the relationship between tiny cysts and symptoms remains debated.⁶

Pain is the main reason adults seek treatment. In surgical case series, pain is the leading indication for operating, accounting for about a third of cases, followed by infertility concerns.⁷ If a cyst is painless and you can live with it, there is no medical urgency to do anything.

The Anxiety Factor

It is worth acknowledging that the question “will this go away?” is often driven less by physical symptoms and more by worry. Finding any lump near a testicle is alarming, and the first fear for most people is cancer. That fear is well-documented: testicular lumps and scrotal pain both cause significant anxiety, usually related to concerns about malignancy.⁸

An epididymal cyst is not cancer. It is a fluid-filled sac, not a solid tumor, and it does not increase your risk of testicular cancer. On ultrasound the distinction is usually obvious, and a simple scan can resolve the question within minutes. If you have been told by a doctor that the lump is an epididymal cyst, the malignancy concern is off the table. The lingering worry after that point is normal, but it should not drive you toward unnecessary surgery. Men who request removal purely for peace of mind sometimes end up with surgical complications that are worse than the cyst ever was.

Does an Epididymal Cyst Affect Fertility?

This is one of the most common follow-up concerns, and the evidence is consistently reassuring. A study comparing men with and without epididymal cysts found no association between the presence of cysts and infertility.⁵ A more recent evaluation of men presenting for fertility workups confirmed that cyst size and whether cysts were on one side or both did not correlate with any semen parameter, including sperm concentration, motility, and morphology.⁹

A separate concern is whether removing a cyst could harm fertility, since the epididymis is the tube through which sperm travel and mature. Traditional open surgery carries some risk of damaging that tube. However, microsurgical cystectomy techniques have been shown to preserve sperm count, motility, and morphology when checked a year after surgery. In patients whose cysts were larger than about 2.5 centimeters, sperm count actually improved after removal, possibly because the large cyst had been compressing the epididymal duct.¹⁰ So the cyst itself does not seem to impair fertility, and removing it with modern techniques does not either.

Treatment Options If a Cyst Persists or Bothers You

If watchful waiting has not led to resolution and the cyst is causing pain, cosmetic concern, or persistent anxiety, there are two main treatment paths beyond leaving it alone.

Aspiration and Sclerotherapy

This is the less invasive option. A needle is used to drain the fluid, and sometimes an irritating agent (often alcohol) is injected to scar the cyst walls together and prevent refilling. In one series tracking outcomes at a median of about two and a half years, roughly three quarters of epididymal cysts resolved after a single aspiration-and-sclerotherapy session. Patients whose cysts refilled were offered a second procedure, and all of those achieved resolution the second time. The overall success rate after at most two attempts was about 85%.¹¹

Aspiration alone, without the sclerosing agent, has a high recurrence rate. The cyst simply refills with fluid. That is why most doctors who offer aspiration pair it with sclerotherapy. The procedure is done under local anesthesia and carries fewer risks than surgery, but it is generally not first-line for younger men who want children, because the sclerosant can theoretically damage nearby epididymal tissue.

Surgical Removal

Surgery is reserved for cysts that are clearly symptomatic, have failed conservative management, or are large enough to cause mechanical discomfort. The traditional approach, open spermatocelectomy, works well but carries a risk of inadvertently cutting into the epididymal tubule, which can block sperm flow on that side. For men who care about preserving fertility, microsurgical techniques have changed the calculus. A study of microsurgical spermatocelectomy found no cyst recurrence and no testicular atrophy after an average follow-up of about 17 months, and none of the patients who had pre- and post-operative semen analyses experienced a drop in sperm count.⁷ Every patient who had gone in with pain reported improvement afterward.

A newer refinement, the microscopic single-tubule technique, aims to reduce injury to the epididymis even further. Early outcomes suggest lower complication rates and good fertility preservation, and some authors argue it should be the preferred approach for men who want to father children in the future.¹²

Spermatocele Versus Epididymal Cyst

You will sometimes see the terms “epididymal cyst” and “spermatocele” used interchangeably, and sometimes distinguished. Strictly speaking, a spermatocele contains sperm cells in its fluid while a simple epididymal cyst contains clear fluid without sperm. In practice, the distinction only matters under a microscope. Both feel the same on exam, look the same on ultrasound, behave the same over time, and are managed the same way. If your doctor calls it one thing and the internet calls it the other, it does not change anything about your prognosis or treatment options. The surgical and natural-history literature often lumps them together.

Rare Complications Worth Knowing About

Epididymal cysts are overwhelmingly benign and undramatic. But there are a couple of uncommon scenarios that deserve mention so they do not catch you off guard.

The most notable rare event is torsion of the cyst itself, where a larger cyst twists on its stalk and cuts off its own blood supply. This causes sudden, severe scrotal pain that can mimic testicular torsion, a genuine surgical emergency. In reported cases, patients have presented with acute pain, and ultrasound revealed a normal testicle alongside an inflamed, debris-filled cyst. Surgery to remove the twisted cyst resolved the symptoms.² This is rare enough to be the subject of individual case reports rather than large studies, but it underscores why sudden, severe scrotal pain should always be evaluated urgently. Do not assume a known cyst is the explanation and wait it out.

Infection of an epididymal cyst is another uncommon but possible complication, more theoretical than frequently documented. Large cysts are considered slightly more vulnerable to infection than small ones, though published data on this is limited to case-level evidence.

When Cysts Signal Something Else

Isolated epididymal cysts are almost always a one-off finding with no broader medical significance. There is, however, one exception worth mentioning: von Hippel-Lindau disease, a rare genetic condition that predisposes people to tumors and cysts in multiple organs. In men with this syndrome, epididymal masses called cystadenomas are common, found in over half of male patients. About two thirds of those cases are bilateral.¹³ These are technically different from ordinary epididymal cysts (they are solid or partly solid, not purely fluid-filled), but they can be discovered during the same kind of scrotal exam or ultrasound.

If you have bilateral solid epididymal masses and a family history of unusual tumors, retinal problems, or kidney cysts, your doctor may consider screening for von Hippel-Lindau disease. For the vast majority of men who find a single fluid-filled cyst, this is not relevant. But it is the kind of edge case that shows up in worried late-night internet searches, so it is worth knowing that the connection is real but extremely narrow in scope. A simple, unilateral, fluid-filled epididymal cyst in an otherwise healthy man is not a sign of a genetic syndrome.

Practical Guidance for Living With a Cyst

If you have been told you have an epididymal cyst and you are deciding what to do, here is how most urologists think about it. The cyst is not dangerous. It is not cancer. It almost certainly is not affecting your fertility. If it does not hurt and is not growing, you can safely ignore it for as long as you like. Rechecking with ultrasound every year or two is reasonable if you want monitoring, but it is not mandatory for a confirmed simple cyst.

If the cyst is painful, give it time first, particularly if you are younger. The pediatric data showing resolution in months to a couple of years gives reason to be patient, and while adult resolution rates are not as well studied, clinicians see adult cysts wax and wane in practice. If the pain persists or the cyst is large enough to be physically bothersome, aspiration with sclerotherapy is a reasonable next step for men who are not planning future children. For men who do want to preserve fertility, microsurgical excision offers a way to remove the cyst with minimal risk to the reproductive tract.¹⁰

Supportive underwear and over-the-counter anti-inflammatories can help manage mild discomfort in the meantime. There is no evidence that any supplement, diet change, or home remedy will make a cyst shrink or disappear. The biology here is simple fluid accumulation in a blind-ended duct, and it either resolves on its own or it does not. What you can control is how much you let it occupy your mental space, and for most men, the right answer is not much.