RESUMO
Objective To explore the clinical value of intracranial translucency (HT) in open spina bifida at 11-13 +6 weeks of gestation.Methods Abdominal ultrasound was performed in 200 cases of normal fetus and 6 cases of confirmed open spina bifida at 11-13 +6 weeks of gestation to compare the morphology of IT,diencephalon and midbrain.Results Fetal IT was readily recognized in all 200 normal cases,with diencephalons and midbrain showing number "8" shape.In 6 cases of open spina bifida,fetal IT cannot be identified,and the expected " 8" shape of diencephalon and midbrain was distorted.During 11-13 +6 weeks of pregnancy,the fetal brain is caused by intracranial negative pressure,resulting in morphological changes in the intracranial hyaline,diencephalon and mesencephalon.Conclusions Fetal brain characteristics including intracranial translucency and the shape of diencephalon and midbrain in 11-13 +6 weeks gestation are valuable ultrasound screening indicators for opens pina bifida.