Children have progressive neurodevelopmental delay, although life expectancy may be normal. Trisomy 9 mosaicism is a rare disorder. Characteristic ultrasound findings include microcephaly, craniofacial defects,
screening.Comprehensivechromosomalscreening.RepetitivetrophectodermembryobiopsyIntroductionTrisomyisthemostcommonchromosomalabnormalityinhumans.Trisomy21,commonlyknownasDownsyndrome,isthemostcommonnonlethaltrisomyinhumansusuallyaris-ingdenovowithintheembryoinassociationwithadvancedmaternalage.Detectionoffetuseswithtrisomy21isthepri...