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sperm granuloma
A sperm granuloma is a lump of extravasated sperm that appears along the vasa deferentia or epididymides in vasectomized men. Sperm granulomas are rounded or irregular in shape, one millimeter to one centimeter or more, with a central mass of degenerating sperm surrounded by tissue containing blood vessels and immune system cells.〔McDonald S. "Cellular responses to vasectomy." International Review of Cytology. 2000;199:295-339. PMID 10874581〕 Sperm granulomas can be either asymptomatic or symptomatic (i.e., either not painful or painful, respectively) (see post-vasectomy pain syndrome).
The vast majority of sperm granulomas in vasectomized men are present as a result of the pressure-induced changes of vasectomy.〔Silber S. "Reversal of vasectomy and the treatment of male infertility: role of microsurgery, vasoepididymostomy, and pressure-induced changes of vasectomy." Urologic Clinics of North America. 1981;8:53-62. PMID 7210354〕
== References ==
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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