UNOSSIFIED NASAL BONE / ABSENT NASAL BONE IN SCAN — WHAT DOES IT MEAN?

Dr. Zohra Ahmad
Fetal Medicine Specialist
Institute of Human Reproduction

The nasal bone is a paired bone forming the anterior wall of the nasal cavity and is largely responsible for the shape of the nose. The nasal bones are variable in size and form in different individuals. The first trimester scan is an important tool of risk assessment for fetal aneuploidies. The presence or absence of fetal nasal bone is an important secondary marker for risk allocation.

1. What is Unossified / Absent Nasal Bone?

It refers to a finding on ultrasound that nasal bone is not seen or appears small. It is due to delayed ossification of the nasal bone. In the report, it may be mentioned as either unossified, absent, or hypoplastic nasal bone. Unossified and absent nasal bone means that nasal bone is not seen while Hypoplastic nasal bone means nasal bone is seen but very small.

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