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３例性腺外卵黄囊瘤均为女性，年龄为２岁（１例）及１．５岁（２例）。肿瘤发生部位：骶前２例，子宫１例。肿块大小：骶前１例向上侵犯上端直肠系膜，向前侵犯膀胱。１例在骶前可触及６．０ｃｍ×５．０ｃｍ大小肿块，发生在子宫者可见子宫内有一３．６ｃｍ×３．５ｃｍ...
Three cases of extragonadal yolk sac tumors were female and were 2 years old (1 case) and 1.5 years old (2 cases). Tumor site: 2 cases before ankle and 1 case of uterus. The size of the mass: 1 case in the upper part of the diaphragm invaded the upper mesorectum and invaded the bladder. 1 case was palpable to a size of 6.0cm x 5.0cm before the fistula, and 3.6cm x 3.5cm was seen in the uterus of the uterus.