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首页> 外文期刊>Ultrasound in obstetrics & gynecology: the official journal of the International Society of Ultrasound in Obstetrics and Gynecology >How early are fetal cerebral sulci visible at prenatal ultrasound and what is the normal pattern of early fetal sulcal development?
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How early are fetal cerebral sulci visible at prenatal ultrasound and what is the normal pattern of early fetal sulcal development?

机译：在产前超声检查中可以看到胎儿脑沟多早，早期胎儿沟的正常形态是什么？

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OBJECTIVES: To evaluate the time of appearance and pattern of development of fetal cerebral sulci at prenatal ultrasound. METHODS: We studied 50 normal fetuses for visibility of cerebral sulci, especially sulci which appear early in anatomical studies, namely the parieto-occipital fissure, calcarine sulcus, cingulate sulcus, convexity sulci and insula/Sylvian fissure. The gestational ages of the fetuses studied ranged from 15.6 to 29.6 weeks. RESULTS: Sulci could be seen by transabdominal ultrasound as early as 18.5 weeks. Medial hemispheric sulci and the insula were visible earlier and more confidently than convexity sulci. The earliest gestational ages at which specific sulci could be seen in any fetus were as follows: parieto-occipital fissure 18.5 weeks, calcarine sulcus 18.5 weeks, cingulate sulcus 23.2 weeks and convexity sulci 23.2 weeks. In the present series, the gestational ages at which these sulci were always visible were as follows: parieto-occipital fissure >20.5 weeks, calcarine sulcus >21.9 weeks, cingulate sulcus >24.3 weeks and convexity sulci >27.9 weeks. The insula and its margin (the circular sulcus) and the overgrowing opercula undergo characteristic maturation. The circular sulcus at the margin of the insula was initially smooth but started becoming angular after about 17 weeks as it started to be overgrown by the parietal and temporal lobe opercula. Initially the insula/operculum angle was obtuse. An acute angle was first evident at 23.2 weeks and in all fetuses older than 24.5 weeks. Our ultrasound data were consistent with anatomical studies and fetal magnetic resonance imaging findings. CONCLUSIONS: Some cerebral sulci can be seen at prenatal ultrasound as early as 18.5 weeks. Familiarity with the normal pattern of sulcal development and the discriminating gestational ages for the appearance of different sulci may allow early suspicion of lissencephaly. Copyright (c) 2004 ISUOG. Published by John Wiley & Sons, Ltd.
机译：目的：评估产前超声检查胎儿脑沟出现的时间和发育方式。方法：我们研究了50名正常胎儿的脑沟可见性，尤其是在解剖学研究中较早出现的沟，即顶枕沟，钙car沟，扣带状沟，凸沟和岛/西尔维亚裂。研究的胎儿的胎龄为15.6至29.6周。结果：早在18.5周就可以通过腹部超声检查发现Sulci。与凸形沟相比，内侧半球沟和岛沟更早，更可靠地可见。可以在任何胎儿中看到特定沟的最早的胎龄如下：顶枕沟18.5周，钙化ine沟18.5周，扣带状沟23.2周和凸沟23.2周。在本系列中，这些沟始终可见的胎龄如下：顶枕裂隙> 20.5周，钙化ine沟> 21.9周，扣带状沟> 24.3周和凸沟> 27.9周。岛突及其边缘（圆形沟）和过度生长的腹膜会经历特征性的成熟。岛缘边缘的圆形沟最初是光滑的，但在约17周后开始变得有角，因为它开始被顶叶和颞叶小孔长满。最初，岛顶/ oper腹角钝。在23.2周以及所有24.5周以上的胎儿中，首先出现了锐角。我们的超声数据与解剖学研究和胎儿磁共振成像结果一致。结论：产前超声检查可早在18.5周就可见到一些脑沟。熟悉正常的颅沟发育模式和不同的沟渠出现的可区分的胎龄可能会导致早期怀疑小脑畸形。 ISUOG版权所有（c）2004。由John Wiley＆Sons，Ltd.出版

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