Most important feature to diagnose fetal aneuploidy:
Absent nasal bone
Nuchal translucency
Increase in frontomaxillary angle
Reversal of ductus venosus flow
B i.e. Nuchal translucencyRef: Current Progress in Obstetrics and Gynecology; John Stud, Volume 1, page 17Explanation:Ultrasound Markers of Fetal Aneuploidy:Nuchal translucency is the single most powerful tool. More than 3 mm needs evaluation.Absence of nasal bone.Absence or reversal of flow in the ductus venosus on Doppler.Tricuspid regurgitation.Increase in frontomaxillary angle more than 85 deg.
Gynaecological Disorders in Obs.