Findings:

A bidirectional color doppler flow at the fetal nose is seen, which not completely but partly rules out the possibility of choanal atresia.

Key-points:

·         Choanal atresia may be associated with significant polyhydramnios.

·         Examining Doppler flow in the fetal nose may aid in diagnosing choanal atresia.

·         Magnetic resonance imaging can be beneficial when choanal atresia is suspected.

·         The ultimate diagnosis is done on post-natal CT scan.