Trait

Abnormal mastoid morphology

An abnormality of the mastoid process, which is the conical prominence projecting from the undersurface of the mastoid portion of the temporal bone.

HPO HP:0000264

Also called: Abnormality of mastoid process of temporal bone, Abnormality of the mastoid
Body system: Abnormality of head or neck Abnormality of the musculoskeletal system

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1 gene linked to Abnormal mastoid morphology

Changes in these genes cause rare conditions in which Abnormal mastoid morphology is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.

Gene	How often it is seen	Conditions
DLX3distal-less homeobox 3	Often (30–79%)	In 2 conditions

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Narrower traits

Broader traits

Abnormality of the skull

Where this comes from

The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
Data release 2026.10.17-8666dff2.

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