卵巢卵黄囊瘤的CT、MRI表现及其病理基础  

Ovarian Yolk Sac Tumor:CT,MRI Findings and Their Pathological Bases

作　　者：刘衡[1] 史军丽[1] 王永涛[1] 刘江勇[1] 金开元[1] 李邦国[1] 张体江[1] 

机构地区：[1]遵义医学院附属医院影像科、医学影像中心,贵州省563003

出　　处：《临床放射学杂志》2014年第9期1395-1398,共4页Journal of Clinical Radiology

摘　　要：目的分析卵巢卵黄囊瘤(YST)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7例卵巢YST的CT和MRI表现。6例行CT扫描(其中5例行增强扫描),1例行MRI平扫及增强扫描。结果 4例YST为单发圆形或类圆形肿块,边界清楚;3例形态不规则,有明显分叶。肿瘤大小约7.5cm×10.4 cm^19.0 cm×21.5 cm。CT平扫6例肿块密度不均匀,均伴有斑片状低密度区,1例病灶内见钙化;MR平扫T1WI病灶以等、低信号为主,T2WI呈等、高混杂信号,囊变、坏死区呈更长T1、更长T2信号。CT、MRI增强扫描:动、静脉期肿块不均匀强化,延迟期肿块持续强化,且强化范围扩大,有逐步强化特征,5例肿块内见扭曲血管。结论卵巢YST的CT、MRI表现具有一定特征性,结合临床资料特别是血清甲胎蛋白(AFP),有助于诊断与鉴别诊断。Objective CT and MRI findings of 7 cases with pathologically-proved ovarian yolk sac tumors were retro- spectively analyzed. Plain CT scanning was performed in 6 patients, among them additional contrast-enhanced CT scanning was carried out in 5. Both plain MRI scanning and contrast-enhanced MRI scanning were employed in the remaining one case. The results were analyzed. Methods CT and MRI findings of 7 cases with ovarian yolk sac tumors proved by pa- thology were analyzed retrospectively. CT plain scan was performed in 6 patients, CT enhancement scan was performed in 5 patients. MRI plain and enhancement scan was performed in 1 case. Results In four patients the tumor presented as a solitary, oval or rounded and well-defined mass, and in other 3 patients the tumor was manifested as an irregular mass with lobulated margin. The rumor＇s size ranged from 7.5 cm x 10.4 cm to 19.0 cm x 21.5 cm, and the lesion had patch low- density areas. Calcification was noted in one case. Plain MRI showed that on T1WI the lesion was characterized by iso-in- tensity and low-intensity signal and on T2 WI the lesion exhibited heterogeneous iso-intensity and hyper-intensity signal as well as longer T1 and T2 signals of cystic degeneration and necrosis. Tortuous vessels were seen in 5 tumors. Conclusion Ovarian yolk sac tumor have some certain CT and MRI characteristics, which are very helpful in making the diagnosis when the clinical information, especially the serum alpha fetoprotein level, is taken into consideration.

关 键 词：卵巢 卵黄囊瘤 体层摄影 X线计算机 磁共振成像 

分 类 号：R737.31[医药卫生—肿瘤]