Obliteration or blockage of the posterior nasal aperture
Incidence is between 1:5000 and 1:8000 live births
Approximately 60% of<unk> ses are unilateral
More common in girls than in boys
Choanal atresia
Deviated or dislocated nasal septum
Duodenal atresia
Nasal septal hematoma
Branchial cleft anomaly
Nasal polyp
Hirschsprung's disease
Chordoma