The epididymis is a coiled tube that stores and carries sperm away from the testes. It lies on top and behind each testis (or testicle).

When fluid collects in a sac anywhere along the epididymis, a cyst is formed. Such cysts are usually harmless and in general don't cause any pain.

Another name for an epididymal cyst is a spermatocele because these sacs contain sperm.

Common problem

Epididymal cysts are common, particularly in men over the age of 40.

Numerous cysts may develop along the length of the epididymis. When this occurs, the swellings feel like a small bunch of grapes.

Sometimes only one testicle is affected, but in other cases both are.

Treatments

Since these cysts are harmless, and usually small and painless, no treatment is needed. Sometimes the cyst disappears of its own accord.

If, however, it becomes uncomfortable - which may occur if it becomes larger than usual - it can be surgically removed.

See a GP

It's important that any swelling found in or around the scrotum or testes is checked by a doctor. They can confirm the diagnosis and arrange any treatment.

This article was last medically reviewed by Dr Trisha Macnair in January 2008