The detection rate of the chromosomal abnormality of the abnormal fetus detected by ultrasound (33.33%) was higer than the trisomy21 high risk group(4.54%) and abnormal delivery group(9.09%)(P<0.05).
Materials and Methods: Cerebral ct findings in 23 cases with 21trisomy 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。
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Objective: a few trisomy21 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.