We report on a 64-year-old man who had suffered from a left scrotal mass for 14 years. The scrotal mass had grown faster in recent years and eventually occupied the entire left scrotum, thus inducing pain in a standing position. Surgical exploration was performed and disclosed an unusually large multilocular spermatocele, which mimicked a hydrocele on physical examination. The size of the spermatocele was about 7×8×8cm, and it contained sperm. Total excision of the spermatocele was performed, and the patient recovered well. No cystic lesion has recurred during 5 months of follow-up.