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spermatocele
Spermatocele (〔(Entry "spermatocele" ) in ''(Merriam-Webster Online Dictionary )''.〕〔''OED'' 2nd edition, 1989.〕) is a retention cyst of a tubule of the rete testis or the head of the epididymis distended with barely watery fluid that contains spermatozoa. Spermatoceles are the most common cystic condition encountered within the scrotum. They vary in size from several millimeters to many centimeters. Spermatoceles are generally not painful. However, some men may experience discomfort from larger spermatoceles. They are harmless.
==Etiology==
#Spermatoceles can originate as diverticulum from the tubules found in the head of the epididymis. Sperm formation gradually causes the diverticulum to increase in size, causing a spermatocele. They are due to continuity between the epididymis and tunica vaginalis.
#They are also believed to result from epididymitis or physical trauma. Scarring of any part of the epididymis can cause it to become obstructed and in turn form a spermatocele. It can also result from vasectomy.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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