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1·Testicular yolk sac tumor.

比较典型的卵黄囊瘤。

2·Yolk sac tumor rarely involves the pericardium.

卵黄囊瘤很少涉及心包。

3·Objective: To explore CT image of yolk sac tumor out of gonad.

目的：探讨CT在性腺外卵黄囊瘤的临床应用价值。

4·Purpose To study the clinicopathological features of yolk sac tumor (YST) of the heart.

目的：探讨心脏卵黄囊瘤临床病理特征。

5·Methods: Retrospectively analyzed clinical manifestation and ct image of yolk sac tumor out of gonad in 6 cases.

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。

6·ConclusionATRA could inhibit proliferation of yolk sac tumor cell line, and down regulation of VEGF could be the inhibitory mechanism of ATRA on yolk sac tumor cell line in vitro.

结论全反式维甲酸可以抑制睾丸卵黄囊瘤细胞的增殖，抑制肿瘤增殖机制可能与下调VEGF的表达有关。

7·Objective: malignant germ cell tumors occur in childhood at a rate of 2 to 3 cases per million children, and Yolk sac tumor accounts for the most (62.7%) of malignant germ cell tumors.

目的：儿童恶性生殖细胞肿瘤的发病率是百万分之二到三，卵黄囊瘤是其中最常见的儿童恶性生殖细胞肿瘤，约占62.7%。