Rare diseases · Sign or symptom

Complex febrile seizure

HP:0011172

What it means

A febrile seizure that has any of the following features: focal semiology (or associated with post-ictal neurologic abnormalities beyond drowsiness, such as a Todd's paresis), prolonged seizure beyond 15 minutes, or recurring (occurring more than once) in a 24 hour period.

Children presenting with a prolonged seizure stopped with anticonvulsive therapy (i.e., diazepam) before the 15th minute should be classified within this group.

Rare diseases that can present with this6

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: Complex febrile convulsion · Complex febrile seizures · Complex fever fit

Complex febrile seizure

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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.