Rare diseases · Sign or symptom
Dilatation of the cerebral artery
HP:0004944
What it means
The presence of a localized dilatation or ballooning of a cerebral artery.
Aneurysm is considered a severe form of dilatation.
In everyday care
Most people with this sign do not have a rare disease — it appears in common conditions far more often. These general reference pages cover the same topic:
Rare diseases that can present with this19
Common30–79%
4Sometimes5–29%
11- 17q11microdeletion syndrome
- Autosomal dominant polycystic kidney disease
- Classical Ehlers-Danlos syndrome
- Craniofaciofrontodigital syndrome
- Familial aortic dissection
- Familial hyperaldosteronism type I
- Familial thoracic aortic aneurysm and aortic dissection
- Glycogen storage disease due to acid maltase deficiency
and 3 more in this range
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: Brain aneurysm · Cerebral aneurysm · Cerebral artery aneurysm · Intracranial aneurysm
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
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.