Gelastic seizures
Pronunciation: guh-LAS-tik
Seizures characterized by inappropriate laughter or smiling, often associated with hypothalamic hamartomas.
Full Definition
Gelastic seizures are characterized by episodes of inappropriate laughter or smiling that lack the emotional component of true mirth. The laughter is typically forced, hollow, or mechanical in quality. These seizures are most commonly associated with hypothalamic hamartomas but can occasionally arise from other brain regions including the temporal or frontal lobes. Gelastic seizures often begin in early childhood and may be followed by other seizure types. The term derives from the Greek word 'gelos' meaning laughter, and these seizures are often misdiagnosed as behavioral problems rather than epilepsy.
Usage
Usage note: Distinguish from dacrystic seizures, which involve crying rather than laughter.
In Context
- "The child's gelastic seizures were initially dismissed as inappropriate behavior before the underlying hypothalamic hamartoma was identified." — Case study presentation
- "MRI revealed a hypothalamic hamartoma consistent with the patient's gelastic seizures." — Radiology correlation report