无精子症是 为严重的男性不育症,3次精液离心检测均找不到精子,可以诊断为无精子症。无精子症可以分为梗阻性和非梗阻性两大类。在无精子症病人中,梗阻性原因所占的比例也较多,为42.4%-48% 。梗阻性无精子症(obstructive azoospermia, OA),指由梗阻导致的精液和射精后尿液中无精子和精原细胞,是造成男性不育的重要病因。梗阻可发生在输精管、射精管、附睾等不同水平,有些是先天性输精管缺如(congenital sence of the vas defenses,CAVD)。
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