An epididymal cyst is a sperm-filled cyst in the collecting tubes located just behind the testicle. This is often (medically) referred to as a spermatocele. Most times there are no symptoms and a spermatocele is diagnosed by self-examination or by a physician on routine physical examination. Symptoms, if present, can include, pain, swelling, and heaviness in the scrotum or redness of the scrotum. Treatment (surgical removal) is usually indicated when there are complaints of increase swelling, pain or discomfort, or embarrassment secondary to enlarged size.