Class Ⅰ prenatal ultrasound
Grade Ⅰ prenatal ultrasound, generally black and white B-ultrasound, is used to exclude fatal deformities, including anencephaly, severe encephalocele, severe open spina bifida, severe chest and abdominal wall defects, internal valgus eversion, single cavity Examination of heart, fatal cartilage dysplasia, etc.
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