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Definition
By Mayo Clinic staffA spermatocele is a cyst that develops in the epididymis — the small, coiled tube situated in the upper testicle that collects and transports sperm. Generally painless and noncancerous, a spermatocele usually is filled with milky or clear fluid that may contain sperm.
Spermatoceles are small, usually less than a half-inch (less than 1 centimeter) in diameter, although some may be larger. Most of the volume of the cyst is fluid.
Spermatoceles are common, affecting as many as three in 10 American men. They typically don't impair fertility or require treatment. If a spermatocele grows large enough to cause discomfort, your doctor may suggest surgery.
