Rare diseases · Sign or symptom
Bilateral choanal atresia
Bilateral blockage of the rear opening of the nasal cavity
HP:0004502
What it means
Bilateral absence (atresia) of the posterior nasal aperture (choana).
Rare diseases that can present with this1
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Bilateral obstruction of the rear opening of the nasal cavity
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.