Rare diseases · Sign or symptom

Abnormal medulla oblongata morphology

HP:0011441

What it means

An abnormality of the medulla oblongata, the lower half of the brainstem.

The medulla oblongata, which is often referred to simply as the medulla, comprises the medullary reticular formation, inferior olivary complex and cochlear nuclear complex, among other structures.

Rare diseases that can present with this4

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 the medulla oblongata · Abnormality of the myencephalon

Abnormal medulla oblongata morphology

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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.