原发性卵黄囊瘤CT表现

CT manifestations of primary yolk sac tumor

目的观察原发性卵黄囊瘤患者的CT表现。方法回顾性分析经病理证实的31例原发性卵黄囊瘤的临床及CT表现,其中8例仅接受CT平扫,23例接受CT平扫及增强扫描。结果 19例肿瘤位于性腺,包括单侧卵巢11例,睾丸8例;12例肿瘤位于性腺外,包括骶尾部7例,前纵隔3例,阴道2例。20例肿瘤呈椭圆形,11例形态不规则;20例肿瘤边界相对清楚,11例边界模糊;2例合并畸胎瘤,瘤内可见脂肪、钙化。增强扫描示23例肿块实性部分呈中度至明显强化,17例呈丝瓜瓤样强化,18例可见供血血管,21例病灶边缘见延迟强化的包膜;4例显示肿瘤包膜破裂。结论卵黄囊瘤CT表现具有一定特征性,可为诊断提供影像学依据。

Objective To observe CT features of primary yolk sac tumor（YST）.Methods Clinical data and CT findings of 31 patients with primary YST proved by pathology were analyzed retrospectively.Plain CT was performed in 31 patients,while contrast enhanced CT scanning was performed in 23 patients.Results The lesions in 19 patients located in the gonads,including ovaries（n=11）and testes（n=8）.Other lesions in 12 patients located out of gonads,including sacrococcygeal region（n=7）,anterior mediastinum（n=3）and vagina（n=2）.The tumors were oval shaped in 20 patients,while irregular shaped in other 11 patients.Well-defined boundary was found in 20 patients,whereas ill-defined boundary was found in 11 patients.Fat and calcification were found in 2 patients with teratomas.Moderate to marked enhancement of the solid part of tumors were observed in 23 patients,loofahs enhancement were observed in 17 patients,the blood vessels were found in 18 patients,while delayed enhancement of coated edge was found in 21 patients.The rupture of tumor capsule was found in 4 patients.Conclusion CT manifestations of YST have certain characteristics,which can provide imaging diagnostic evidences.