Rare diseases · Sign or symptom

Hypoplasia of mandible relative to maxilla

HP:0410219

What it means

Abnormally small dimension of the mandible (lower jaw) relative to the maxilla (upper jaw).

Rare diseases that can present with this1

Sometimes5–29%

1

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

Micrognathia

Also called: Disorder of mandibular and maxillary dental arch relationship

Hypoplasia of mandible relative to maxilla

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This 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.