摘要
目的分析卵黄囊瘤的CT和MRI表现,提高对本病的认识和影像诊断水平。方法回顾性分析经病理证实的20例卵黄囊瘤的CT和MRI表现,其中仅行MRI检查8例,仅行CT检查9例,另3例均行CT和MR检查。结果肿瘤位于睾丸5例、卵巢7例、前纵隔6例、腹腔1例、小脑半球1例。肿瘤呈类圆形或分叶状,CT平扫肿瘤呈等或低密度,均未见脂肪、钙化,实性成分渐进性强化。MR平扫肿瘤实性部分T1W以等、低信号为主,T2W稍高信号,囊变部分呈明显长T1、长T2信号,部分肿瘤见出血。增强扫描显示肿块实性部分及分隔中度至明显强化。15例行术前血清AFP检查,其中11例明显升高,治疗后下降。结论卵黄囊瘤CT和MRI表现具有一定特征性,结合年龄及血清AFP,有助于术前诊断。
Objective To investigate CT and MRI findings of yolk sac tumor and improve the understanding and imaging diagnosis level of such disease. Methods CT and MRI findings of 20 cases pathologically confirmed to have yolk sac tumor were retrospectively analyzed, of which 8 cases only received MRI, 9 cases only received CT and 3 cases received both MRI and CT. Results Of the 20 cases, there were 5 cases with the tumors located in testicle, 7 cases with the tumors located in ovary, 6 cases with the tumors located in anterior mediastinum, 1 case with the tumor located in abdominal cavity and 1 case with the tumor located in cerebellum. The masses were oval or lobulated and characterized as iso-density and low-density by plain CT and progressive enhancement on contrast-enhanced CT. The solid component of the tumor was characterized as isointensity and low-intensity by T1 W image and as slightly high-intensity by T2 W image. The cystic component manifested as long T1 and long T2 intensity in plain MR. Contrast-enhanced MRI showed that the solid component and septum of the tumors were intermediately and significantly enhanced. No fat and calcification was detected. Serum alpha fetoprotein（AFP） tests were performed in 15 cases before operation, of which 11 cases showed significantly increased AFP, which declined after treatment. Conclusion Yolk sac tumor presents some certain CT and MRI characteristics, which can help to make a preoperative diagnosis combining with the age and serum AFP.
出处
《广东医学院学报》
2016年第5期494-497,共4页
Journal of Guangdong Medical College
