「精液囊腫」是因男性生殖道內精液積聚所形成之液狀囊腫，雖然管道狹窄而造成囊性腫大被認為是其可能原因之一，但造成其狹窄之病理成因仍不甚清楚；大部份精液囊腫皆為小型且呈單房型態，無表現症狀居多，故多為體檢時意外發現，初期以觀察及保守治療即可，但若有症狀或體積太大時，則可考慮手術治療，手術治療以開刀切除及局部注射硬化劑兩類為主。在此提出之個案報告為一位六十四歲男性，其陰囊十年多來持續異常腫大且疼痛不已，根據位置及內容物之精液分析內含精子而診斷為「精液囊腫」，病患被此巨大之囊腫困擾許久，最後接受囊腫切除手術，術後追蹤恢復良好且無併發症或復發情形。

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.