目的：对13及18三体综合征胎儿的超声表现特征和产前超声筛查价值的评价。
Objective:To evaluate sonographic characteristics on prenatal ultrasound study of trisomy 13 and 18…
材料与方法：回顾性分析23例经细胞遗传学检查证实的21三体综合征的脑部ct表现。
Materials and Methods: Cerebral ct findings in 23 cases with 21 trisomy syndrome, proved by cytogenetics, were retrospectively analyzed.
结果128例胎儿核型中，9例为18三体综合征，2例为其它染色体异常，染色体异常发现率为8·59%（11/128）。
Results Nine cases of trisomy 18 and 2 cases of other abnormal karyotype were found among the 128 pregnant women (8.59%, 11/128).
结论唐氏综合征动物模型16三体鼠伴有先天性巨结肠，这种动物模型可用于研究先天性巨结肠病。
Conclusion trisomy 16 mice occur with congenital megacolon, and trisomy 16 mice may be also regard as an animal model for Hirschsprung's disease.
结论唐氏综合征动物模型16三体鼠伴有先天性巨结肠，这种动物模型可用于研究先天性巨结肠病。
Conclusion trisomy 16 mice occur with congenital megacolon, and trisomy 16 mice may be also regard as an animal model for Hirschsprung's disease.
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