Spermatocele (Epididymal Cysts): A UK Guide to Scrotal Lumps

A spermatocele, often referred to as an epididymal cyst, is a common condition where a fluid-filled sac develops in the epididymis. The epididymis is the coiled tube located at the back of each testicle that stores and transports sperm. Unlike other testicular issues, a spermatocele is specifically located outside the main body of the testicle itself.

In the United Kingdom, these cysts are extremely common, affecting approximately one in three men at some point in their lives. They contain clear or milky fluid and sometimes dead sperm cells. Most importantly, they are benign (non-cancerous) and are not a sign of testicular cancer. However, because it can be difficult to tell different types of lumps apart through self-examination, clinical confirmation is essential.

For many men in the UK, a spermatocele is discovered by accident during a shower or a routine self-check. Because they often don't cause pain, they can exist for years without being noticed. Common signs include:

• A separate, soft, smooth lump felt at the top or back of the testicle.
• The lump often feels like a third small testicle or a pea-sized grape.
• No pain or tenderness when the lump is pressed.
• A sensation of heaviness in the scrotum if the cyst grows large.
• Visible swelling in the scrotum in rare, advanced cases.

According to NHS guidance, a spermatocele is usually distinct from the testicle; you should be able to feel the 'gap' between the cyst and the testis. If the lump feels like it is part of the testicle itself, it requires more urgent investigation.

The exact cause of spermatoceles remains largely unknown. Medical experts suggest they may occur due to a blockage in one of the many small tubes within the epididymis where sperm is transported. This blockage causes fluid to back up, forming a cyst.

Factors that might contribute to their development include:

• Physical trauma or injury to the scrotum.
• Inflammation of the epididymis (epididymitis).
• Previous surgery in the groin area.
• Congenital factors (present from birth).

It is important to note that having a spermatocele does not increase your risk of testicular cancer, nor does it typically interfere with your ability to father children.

If you notice a lump, the first step is to book a consultation with a healthcare professional. A GP will perform a physical examination, which may involve 'transillumination'—shining a bright light through the scrotum. Because spermatoceles are fluid-filled, the light will usually shine through them, whereas a solid tumour would block the light.

Following NICE (National Institute for Health and Care Excellence) protocols, if any uncertainty remains, your GP will refer you for a scrotal ultrasound. This is a painless procedure that uses sound waves to create an image of the inside of the scrotum. It is the gold standard for distinguishing between harmless cysts, hydroceles (fluid around the testicle), and solid masses that may require further investigation.

Many men feel embarrassed or anxious about scrotal lumps, which can lead to delays in seeking advice. Using an online doctor service in the UK is a convenient and discreet way to begin the conversation. While an online GP cannot perform a physical palpation, they can:

• Assess your symptoms and medical history via a video consultation.
• Explain the differences between various scrotal conditions.
• Provide a referral for a private or NHS ultrasound scan.
• Discuss 'red flag' symptoms that require immediate attention.
• Provide reassurance and education on how to perform a proper testicular self-examination.

If you are experiencing anxiety about a new lump, speaking to a GP online can provide the necessary next steps without the wait for an in-person appointment.

Most spermatoceles do not require treatment. If the cyst is small and not causing pain, UK doctors usually recommend a 'watch and wait' approach. However, if the cyst grows large enough to cause discomfort or affects your quality of life, options include:

Spermatocelectomy

This is a surgical procedure to remove the cyst from the epididymis. It is usually performed as day surgery under general or local anaesthesia. While effective, it carries a small risk of affecting fertility in that specific testicle due to potential damage to the epididymis, so it is often avoided in men who still wish to have children.

Sclerotherapy and Aspiration

A needle is used to drain the fluid, and a chemical is injected to scar the sac closed. This has a higher recurrence rate than surgery but is less invasive.

Pain relief such as paracetamol or ibuprofen can be used for occasional aches associated with the cyst. Wearing supportive underwear, like briefs instead of boxers, can also help reduce the sensation of heaviness.