Rare diseases · Sign or symptom
Abnormality of frontal sinus
Abnormality of the forehead sinus
HP:0002687
What it means
An abnormality of the frontal sinus, one of the mucosa-lined, normally air-filled paranasal sinuses of the bones of the skull. The frontal sinus is located within the frontal bone.
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: Abnormality of sinus frontalis
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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.