目的：探讨CT在性腺外卵黄囊瘤的临床应用价值。
Objective: To explore CT image of yolk sac tumor out of gonad.
方法：回顾分析6例经病理证实的性腺外卵黄囊瘤的临床及CT影像表现。
Methods: Retrospectively analyzed clinical manifestation and ct image of yolk sac tumor out of gonad in 6 cases.
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
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