目的:探讨12例卵黄囊瘤二维声像图特征及其病理组织结构。方法:12例卵黄囊瘤经超声检查了解其形态、边界、内部回声及肿块后方回声。术后全部经病理组织学证实。结果:本组12例卵黄囊瘤以实性为主混合性包块多见（10/12）,肿瘤内部以实质性等回声为主,形态不规则,边界清晰,可移动,其内乳头状强回声与液性暗区相互交错,后方回声衰减。结论:根据卵黄囊瘤声像图表现,参考AFP测值可明确诊断。 Objective: To investigate the features and histopathological features of 12 cases of yolk sac tumor. Methods: Twelve yolk sac tumors were examined by sonography for morphology, boundary, internal echo and posterior echogenic mass. All postoperative histopathological confirmed. Results: The majority of yolk sac tumors in this group were mostly solid mixed masses (10/12). The tumors were mainly intraconeal, with irregular echoes, clear boundaries, and clear borders. The inner papillae Strong echo and liquid dark area intertwined, the rear echo attenuation. Conclusion: According to the sonography of yolk sac tumor, the reference AFP measurement can confirm the diagnosis.