Nasal bones are two oblong bones presenting with varying sizes and forms in every individual. They are placed side by side at the middle and upper parts of the face. By their union, they form a bridge of the upper one-third of the nose. Short nasal bone in the fetus occurs due to chromosomal abnormalities. They are commonly seen in Down syndrome, Trisomy 18, and microdeletion.
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Is 4.77 mm nasal bone size normal for a nineteenth-week fetus?
Query: Hi doctor, During my TIFFA USG at 19 weeks and 1 day, the fetal nasal bone measured 0.44 mm. Will the fetal nasal bone develop after few weeks, or it indicates a short nasal bone? Or is it too early to conclude? The scan report showed the following: prominent bilateral pelvis, more on the right side... Read Full »
Answer: Hi, Welcome to icliniq.com. The standard thickness of the nasal bone ranges between 1.5 to 2.5 mm. Your fetal nasal bone thickness is less for the gestation period, and the presence of echogenic focus in the left ventricle indicates endocardial cushion defect, which is seen in the case of Down's sy... Read Full »
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