探讨卵巢无性细胞瘤的超声声像图特征，总结诊断和鉴别诊断要点。

回顾性分析2012年6月至2017年7月北京协和医院收治，经术后病理证实的21例卵巢无性细胞瘤患者22个肿瘤的超声表现及临床病理检查资料。

21例卵巢无性细胞瘤患者多数（15/21）<30岁，平均年龄（25.7±9.0）岁；22个原发肿瘤体积较大，平均径线（10.6±3.6）cm，中位径线11.4 cm；超声均显示附件区实性为主、边界清晰的低回声肿物（单侧肿物20例，双侧肿物1例），部分（11/22）呈类圆形，部分（11/22）呈分叶状，内部回声不均匀，可见条索样中高回声、囊性变的无回声区或钙化成分；肿物内有较丰富的低阻血流。术前超声检查提示盆腹腔积液1例，腹膜后多发肿大淋巴结2例，术后证实转移3例。基因检查显示3例合并染色体异常。20例血清人绒毛膜促性腺激素（hCG）水平均有不同程度升高，为6.3~3800.5 IU/L。

卵巢无性细胞瘤多为年轻女性患者，单侧原发病灶，超声表现为体积较大，以实性为主的低回声肿物，呈类圆形或分叶状结构，边界清晰，内部回声不均匀，可合并小无回声区及钙化灶，有较丰富的低阻血流，结合临床及血清hCG水平可做出初步诊断。

To explore the sonographic features of ovarian dysgerminoma and to evaluate the value of ultrasound in the diagnosis of ovarian dysgerminoma.

Between June 2012 and July 2017, 21 patients had surgically confirmed ovarian dysgerminoma in Pecking Union Medical College Hospital. The twenty-two lesions′ sonographic features and the Patients′ clinical characteristics were reviewed.

Twenty-twoprimary lesions from 21 patients were sized 4.2-16.0 cm in meanand the median mean diameter was 11.4 cm, manifesting as well-defined mass. Half of the lesions were round (11/22) and half of the lesions were lobulated (11/22). The internal echo was mostly hypoechoic and heterogeneous, contained hyperechoic, anechoic or calcified components. Blood supplies of solid components were mainly rich with low resistance. Postoperative metastasis occurred in three cases, including one case of massive pelvic effusion and two cases of enlarged retroperitoneal lymph nodes in ultrasound. Three of them were diagnosed of chromosomal abnormalities in gene test. Elevated serum level of human chorionic gonadotropin (hCG) was observed in all patients, ranging from 6.3 to 3800.5 IU/L.

Patients with ovarian dysgerminoma were mainly of youth age. Ovariandysgerminoma have obvious ultrasonographic characteristics. Combined with serum hCG level, the accuracy of diagnosis could be improved.