Rare diseases · Sign or symptom
Enlarged sylvian cistern
HP:0100952
What it means
An increase in size of the subarachnoid space associated with the lateral cerebral sulcus (Sylvian fissure).
Rare diseases that can present with this2
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: Enlarged lateral fissure · Enlarged lateral sulcus · Enlarged sylvian fissure
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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.