Masking of the Symptoms of Bilateral Congenital Choanal Atresia by a Coexisting Anomaly of the Upper Lip.

Congenital choanal atresia (CCA) is the developmental failure of the nasal cavity to communicate with nasopharynx. Bilateral CCA is an acute emergency in an obligatory nasal breathing neonate. The bilateral involvement in this anomaly presents immediately after birth as respiratory distress and cyanosis, except while crying. We herein describe a newborn with bilateral CCA presenting with no distress either at birth or subsequently during rest, due to a co-existing anomaly.