Conclusion: The ultrasonographic measurement data of nt have an important reference value in prenatal screening of fetal 21-trisomy syndrome.
结论：超声测量胎儿nt值，对2 1 -三体胎儿的筛查有重要的参考价值。
Materials and Methods: Cerebral ct findings in 23 cases with 21 trisomy syndrome, proved by cytogenetics, were retrospectively analyzed.
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。
Objective: a few trisomy 21 cells in normal chromosome karyotype was been observed for study of the correlation of clinical phenotype and development damage in sick children of Down's syndrome.
目的观察正常细胞核型中含有极少量21 -三体细胞的患儿临床表型及发育损害的相关关系。
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