Nasal bone assessment in prenatal screening for trisomy 21

Area of Science:

• Prenatal diagnosis
• Genetics
• Medical imaging

Background:

• A small nose is a common feature in individuals with trisomy 21.
• Previous studies suggest nasal bone abnormalities are more prevalent in trisomy 21 fetuses.

Purpose of the Study:

• To review evidence on fetal nasal bone assessment for trisomy 21 screening.
• To discuss the utility of detecting nasal bone abnormalities via prenatal ultrasound.

Main Methods:

• Review of radiologic, histomorphologic, and sonographic studies.
• Analysis of nasal bone presence and length in fetuses.

Main Results:

• Nasal bone abnormalities, including absence and short length, are significantly more common in trisomy 21 fetuses.
• These abnormalities are detectable by prenatal ultrasound.

Conclusions:

• Fetal nasal bone assessment is a potentially valuable tool for trisomy 21 screening.
• Prenatal ultrasound can identify key nasal bone indicators for trisomy 21.