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目的探讨MR评价胎儿后颅窝池扩张的临床价值。方法参照目前较为公认的标准:胎儿后颅窝池深度≥10mm即为后颅窝池扩张,回顾分析56例胎儿后颅窝池扩张的检查结果。结果将ECM分为10mm-13mm、13.1mm-14.9mm、≥15mm三个组,其中10mm-13mm组39例占69.6%(单纯性小脑延髓池扩张37例、蛛网膜囊肿2例),13.1mm-14.9mm组14例占25.0%(单纯性小脑延髓池扩张8例、蛛网膜囊肿6例),≥15mm组3例占5.4%(Dandy-walker畸形2例、蛛网膜囊肿1例)。结论 MR可清晰准确地显示胎儿后颅窝的发育情况,是产前检查的重要手段,经MR检查获得胎儿后颅窝数据可为围产期检查提供重要参考依据。
Objective To investigate the clinical value of MR in evaluating fetal dilatation of posterior fossa. Methods Reference to the current more accepted standards: fetal posterior fossa depth ≥ 10mm is the posterior fossa dilatation, retrospective analysis of 56 cases of fetal posterior fossa dilatation test results. Results The ECM was divided into three groups of 10mm-13mm, 13.1mm-14.9mm, and 15mm, including 39.6% of the 10mm-13mm group (37 cases of simple cerebellar bulbar pool expansion and 2 cases of arachnoid cyst), 13.1mm 14 cases (-14.9 mm) accounted for 25.0% (8 cases of simple cerebellar bulbar pool expansion and 6 cases of arachnoid cyst), 3 cases accounted for 5.4% ≥15 mm (2 cases of Dandy-walker malformation and 1 case of arachnoid cyst). Conclusion MR can clearly and accurately show the development of fetal posterior fossa, which is an important means of prenatal examination. Obtaining the posterior fossa data by MR examination can provide important reference for perinatal examination.