Spermatocele (Epididymal Cysts): Symptoms, Diagnosis and UK Treatment Options

A spermatocele, often referred to as an epididymal cyst, is a benign (non-cancerous) fluid-filled sac that grows in the epididymis. The epididymis is the coiled tube situated at the back of each testicle that stores and carries sperm. These cysts are incredibly common in the UK, particularly in middle-aged men, though they can occur at any age.

While the word 'cyst' can sound alarming, a spermatocele is not a form of testicular cancer. It typically contains a milky or clear fluid that may include sperm. In most cases, these cysts remain small and do not cause any symptoms, often being discovered incidentally during a routine self-examination or a visit to an online doctor in the UK for unrelated concerns.

Most men with a spermatocele will not experience any pain or noticeable symptoms. However, when symptoms do occur, they may include:

• A smooth, firm lump felt at the top or behind the testicle.
• A feeling of heaviness or fullness in the scrotum.
• Dull aching or discomfort in the affected side, particularly if the cyst grows.
• Swelling in the scrotum that is distinct from the testicle itself.

Because these cysts are separate from the testicle, you can usually feel the 'gap' between the lump and the testicle itself. Unlike some other scrotal conditions, a spermatocele will often 'transilluminate,' meaning if a doctor shines a light through the scrotum, the fluid-filled sac will glow.

The exact cause of a spermatocele is not always clear. According to NHS guidance, they may form due to a blockage in one of the many tubes within the epididymis that transport sperm. This blockage causes a backup of fluid, leading to the formation of a cyst.

There are no specific lifestyle factors that guarantee the prevention of an epididymal cyst, but they are more frequently diagnosed in men between the ages of 20 and 50. Previous trauma to the scrotum or episodes of inflammation (epididymitis) may increase the likelihood of developing one, though many men develop them without any prior history of injury.

If you find a lump, the first step is to speak to a GP online or in person. The diagnostic process usually follows these steps:

Physical Examination

A doctor will gently examine the scrotum to determine the size, location, and texture of the lump. They will check if the lump is attached to the testicle or the epididymis.

Transillumination

By shining a bright light through the scrotal skin, a GP can often tell if a lump is solid (which requires urgent investigation) or fluid-filled (like a cyst).

Ultrasound Scan

If there is any doubt about the diagnosis, a GP will refer you for a scrotal ultrasound. This is a painless procedure that uses sound waves to create an image of the internal structures. NICE clinical knowledge summaries suggest ultrasound is the gold standard for confirming the benign nature of an epididymal cyst and ruling out testicular cancer.

In the vast majority of cases, treatment for a spermatocele is not required. If the cyst is small and not causing pain, doctors usually recommend a 'wait and see' approach. The cyst will not harm the testicles or affect your ability to have children.

However, if the cyst becomes very large or causes significant discomfort, the following options may be considered:

• Observation: Regular self-examinations to ensure the lump isn't changing rapidly.
• Surgical Removal (Spermatocelectomy): A minor surgical procedure performed under local or general anaesthetic to remove the cyst from the epididymis.
• Aspiration: Using a needle to drain the fluid. This is less common because the fluid often returns quickly.

It is important to note that surgery carries a small risk of damage to the epididymis or the vas deferens, which could potentially impact fertility on that side. Therefore, surgery is typically reserved for those with significant symptoms.

It is a fundamental rule of men’s health: any new lump in the scrotum must be checked by a professional. You should speak to a GP online if you notice a new swelling, even if it is painless. An online consultation can be a convenient first step to discuss your symptoms, receive advice on how to perform a self-exam, and get a referral for an ultrasound if necessary.

Accessing a private online GP service allows you to discuss sensitive concerns from the comfort of your home, reducing the anxiety often associated with wait times for traditional appointments. Your doctor can help differentiate between a harmless spermatocele and other conditions like a varicocele, hydrocele, or inguinal hernia.