Objective:To find a useful method to objectively evaluate fetal cerebellar vermis. Methods: Multi slice view (MSV) and oblique view (OBV) mode in three dimensional extended imaging (3 DXI) provided by Accuvix V10 of Medison Company were applied to obtain sagittal plane of fetal cerebellar vermis and observed its structure. Results-. 19 fetus who were suspected vermis agenesis by 2D ultrasound were all obtained sagittal planes of the vermis, which revealed the whole vermis and its relationship with the brain stem, the fourth ventricle and the cisterna magna. Dandy-Walker malformation were found in one case;the vermis with mild posterosuperior rotation were in five cases;smaller vermis in two cases; enlarged cisterna magna in nine cases; ventriculomegaly in two cases. Brain MRI proved them. Conclusions:The sagittal plane of the vermis reconstructed by 3DXI of 3D ultrasound is helpful for further evaluation on the vermis. This method is effective and relatively simple.%目的:寻找一种能较客观评价胎儿小脑蚓部发育的方法.方法:采用Medison公司的Accuvix V10彩色多普勒超声诊断仪,应用其三维超声扩展成像技术(3DXI)中的智能断层成像模式(MSV)和任意剖面成像模式(OBV)来获得胎儿小脑蚓部的正中矢状切面,并对其进行形态观察.结果:19例二维超声检查疑小脑蚓部发育不全的胎儿全部获得小脑蚓部的正中矢状切面,清晰显示完整的小脑蚓部及其与脑干表面、第四脑室和颅后窝池的关系.据此诊断Dan-dy-Walker畸形1例、小脑蚓部上抬5例、蚓部发育过小2例、单纯颅后窝池增宽9例、第四脑室导水管梗阻2例.颅脑MRI证实.结论:运用三维超声的3DXI技术获得的小脑蚓部正中矢状切面可较客观评价胎儿小脑蚓部的发育,方法有效、相对简便.
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