Spermatocele (Epididymal Cysts): Symptoms, Causes, and Treatment in the UK

A spermatocele, often referred to as an epididymal cyst, is a common and typically benign (non-cancerous) fluid-filled sac that develops in the epididymis. The epididymis is the coiled tube located at the back of each testicle that stores and transports sperm. While these cysts are often filled with clear fluid, they may also contain dead sperm cells, which is why they are specifically termed spermatoceles.

According to NHS clinical data, these cysts are very common and can affect men of any age, though they are most frequently diagnosed in men between the ages of 20 and 50. In the vast majority of cases, a spermatocele will remain small and will not interfere with normal testicular function or sexual health.

Most men discover a spermatocele during a routine testicular self-examination or during a clinical physical. The symptoms are often minimal, but may include:

• A painless lump: Usually felt at the top or back of the testicle. It is separate from the testicle itself and can often be moved slightly under the skin.
• Smoothness: The lump typically feels like a smooth, firm pea or marble.
• Heaviness: If the cyst becomes large, you may feel a sense of heaviness in the scrotum on the affected side.
• Dull ache: While usually painless, a large cyst can cause pressure or a dull ache in the groin or scrotum.

It is important to note that because the cyst is located in the epididymis and not the testicle itself, it is usually possible to feel the testicle as a separate structure from the lump.

The exact cause of a spermatocele remains unclear in many cases. However, NICE clinical knowledge summaries suggest that they often occur due to a blockage in one of the tubes in the epididymis that transport sperm. This blockage leads to a buildup of fluid and the formation of a sac.

Factors that may increase the likelihood of developing an epididymal cyst include:

• Inflammation: Previous episodes of epididymitis (inflammation of the epididymis) can cause scarring and blockages.
• Trauma: Any physical injury to the scrotum or testicles.
• Age: They are more frequently seen as men reach middle age.
• Congenital factors: In some rare cases, they may be linked to certain conditions present at birth.

When you consult a doctor about a testicular lump in the UK, the first step is a physical examination. The GP will typically use a technique called transillumination, where a light is shone through the scrotum. Because a spermatocele is fluid-filled, the light will usually shine through it (transilluminate), whereas a solid tumour would block the light.

To confirm the diagnosis and ensure the testicle itself is healthy, the GP will often refer you for a scrotal ultrasound. This is a painless procedure that uses sound waves to create an image of the internal structures. According to NHS guidance, an ultrasound is the gold standard for differentiating between benign cysts and more serious concerns such as testicular cancer.

If you have discovered a lump and are feeling anxious, you can speak to a GP online for an initial assessment. An online doctor can discuss your symptoms, review the location and feel of the lump via your description, and explain the likely causes.

While an online consultation cannot replace a physical examination, the doctor can:

• Assess the urgency of your symptoms.
• Provide a private referral for a scrotal ultrasound if you wish to bypass long waiting times.
• Offer advice on pain management if the cyst is causing discomfort.
• Help you understand the difference between a spermatocele, a varicocele (swollen veins), and an inguinal hernia.

Using an online doctor service in the UK is an efficient way to get professional reassurance and a clear pathway for further investigation.

Watchful Waiting

In most instances, if the spermatocele is small and not causing pain, no treatment is required. This is known as 'active surveillance'. The cyst is unlikely to disappear on its own, but it is not dangerous.

Medication

If the cyst causes minor discomfort, over-the-counter paracetamol or ibuprofen may be recommended to manage the dull ache.

Surgical Intervention (Spermatocelectomy)

If the cyst grows so large that it causes significant pain or interferes with walking or clothing, a urologist may suggest a spermatocelectomy. This is a surgical procedure to remove the cyst from the epididymis while preserving the testicle. This is usually performed as a day-case procedure under general anaesthetic.

Sclerotherapy

Less commonly, a doctor may drain the fluid with a needle (aspiration) and inject a chemical to prevent it from refilling. However, this is rarely used as it can damage the epididymis and affect fertility.