超声观察胎儿帆间池增大及其对预后的影响

Ultrasonic observation on enlarged fetal cavum veli interpositi and its impact on prognosis

目的探讨胎儿帆间池增大的超声特点及其对预后的影响。方法 7440名单胎妊娠孕妇于我院接受常规超声检查,对产前超声诊断帆间池增大的胎儿,仔细检查是否合并其他部位异常,分析帆间池增大的超声特征并定期复查。胎儿出生后,对其进行神经系统发育及身体发育评估。结果共检出8胎胎儿帆间池增大。除1胎合并双侧脑室宽度临界高值10mm外,其余7胎均未发现合并其他部位异常。帆间池增大的超声特点:脑中线上的囊性结构,位于丘脑及大脑内静脉上方,透明隔腔及穹隆下方;多数矢状面及冠状面均呈椭圆形,横切面呈尖向前的三角形无回声区。对所有胎儿出生后随访至今,未发现生长发育或神经系统表现异常。结论认识帆间池的解剖与毗邻结构是诊断帆间池增大的关键。本组产前超声诊断单纯帆间池增大的胎儿出生后神经系统及身体发育均表现正常。

Objective The observe the ultrasonic characteristics of cavum veli interpositi （CVI）, as well as the prognosis of fetuses with enlarged CVI. Methods Totally 7440 pregnant women underwent prenatal ultrasonography. For all fetuses diagnosed with enlarged CVI, careful scans were performed to rule out further malformations, and period scans were also performed to observe the changes of CVI. The ultrasonographic characteristics were analyzed, and postnatal assessment was performed on nervous system and growth condition. Results Totally 8 fetuses were detected with enlarged CVI. In terhemispheric cystlike structure was the only finding in all fetuses, except 1 associated with bilateral borderline ventriculo megaly （10 mm）. The enlarged CVI was a cystlike structure located at the brain midline, inferior to the fornix and cavum septi pellucidi, superior to the thalamus and internal cerebral veins. The shape of most cystlike structures was oval in the midsagittal view, triangular with the apex directed anteriorly in the axial view. Postnatal follow-up showed all normal de- velopment after delivery. Conclusion It is important to know the anatomic location of CVI and surrounding structures. Normal physical growth and neurological development after birth are observed in these 8 cases of enlarged CVI during fetal period.