Absence of nasal bone and detection of trisomy 21.
Monni
Giovanni
G
Zoppi
Maria Angelica
MA
Ibba
Rosa Maria
RM
D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008423:Maternal Age; D009295:Nasal Bone / Q000002:abnormalities*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D018566:Pregnancy, High-Risk; D011296:Prenatal Diagnosis / Q000379:methods*; D012307:Risk Factors