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

A spermatocele, often referred to as an epididymal cyst, is a common condition among British men. It is a fluid-filled sac that forms in the epididymis—the coiled tube located behind each testicle that stores and transports sperm. While the discovery of any lump in the scrotum can be alarming, a spermatocele is typically benign (non-cancerous) and painless.

These cysts usually contain a milky or clear fluid and may include sperm that are no longer motile. According to NHS clinical pathways, they are incredibly common, particularly in men aged 20 to 50, and are often discovered during routine self-examinations or medical check-ups for unrelated issues.

The primary sign of a spermatocele is a smooth, firm lump in the scrotum, typically found above or behind the testicle. Unlike some other testicular issues, these cysts are generally:

• Painless: Most men do not feel any sharp pain, though a sense of heaviness may be present.
• Distinct: The lump can usually be felt separately from the testicle itself.
• Transilluminating: If a light is held against the scrotum, the cyst often allows light to pass through (transillumination), indicating it is fluid-filled rather than solid.

If the cyst grows significantly, it may cause a dull ache or a feeling of pressure in the affected side of the scrotum. However, it rarely affects fertility or sexual function.

The exact cause of a spermatocele remains unclear in many cases. However, medical researchers and NICE (National Institute for Health and Care Excellence) guidelines suggest they may result from a blockage in one of the tubes within the epididymis that transport sperm. This blockage leads to a buildup of fluid, forming the cyst.

Risk factors are not well-defined, but they may include:

• Physical trauma or injury to the scrotum.
• Inflammation of the epididymis (epididymitis).
• Previous surgery in the groin area.
• Age, as they are more frequently diagnosed in middle-aged men.

If you discover a lump, the first step is a physical examination by a GP. The doctor will palpate the area to determine the lump's size, texture, and position. In the UK, if the diagnosis is not immediately clear from a physical exam, a GP will typically refer you for a scrotal ultrasound.

An ultrasound is a non-invasive procedure that uses sound waves to create an image of the internal structures of the scrotum. This is the gold standard for distinguishing between a fluid-filled cyst (like a spermatocele) and a solid mass, which could indicate a more serious condition such as testicular cancer.

In the vast majority of cases, treatment for a spermatocele is not necessary. If the cyst is small and does not cause discomfort, the standard approach is 'watchful waiting.' However, if the cyst causes significant pain or becomes large enough to be bothersome, options include:

Spermatocelectomy

This is the surgical removal of the cyst. It is usually performed as an outpatient procedure under general or local anaesthetic. While effective, surgery carries a small risk of damage to the epididymis, which could potentially affect fertility in that specific testicle.

Aspiration and Sclerotherapy

This involves draining the fluid with a needle (aspiration) and injecting a scarring agent to prevent the fluid from returning (sclerotherapy). This is generally less common than surgery due to a higher recurrence rate.

Many men feel embarrassed discussing scrotal health, which can lead to delays in diagnosis. You can speak to a GP online from the comfort of your home to discuss your symptoms discreetly. An online GP can:

• Assess the history of the lump and any associated symptoms.
• Provide advice on how to perform a proper testicular self-examination.
• Recommend whether a face-to-face physical exam or an urgent ultrasound is required.
• Provide a private referral for imaging if you wish to bypass long NHS waiting times.

Seeking a professional opinion early provides peace of mind and ensures that more serious causes of testicular lumps are ruled out promptly.

If you have been diagnosed with a spermatocele and no surgery is required, you should continue to monitor the area. Wear supportive underwear, such as briefs rather than boxers, if the weight of the cyst causes a dull ache. Over-the-counter pain relief like paracetamol or ibuprofen can help manage occasional discomfort. It is also recommended to perform monthly self-checks to ensure the cyst has not changed significantly in size or texture.