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Acquired hippocampal damage after temporal lobe seizures in 2 infants
E R Perez1, P Maeder, K M Villemure
1Department of Pediatrics, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
Insights
Two infants experienced hippocampal swelling and sclerosis following prolonged seizures. These cases highlight how combined pre-existing and acquired brain conditions can lead to this neurological damage.
Area of Science:
- Neurology
- Pediatric Neurology
- Neuroimaging
Background:
- Hippocampal sclerosis is a common cause of refractory epilepsy, particularly in children.
- Understanding the etiology of hippocampal sclerosis is crucial for effective treatment and management.
Observation:
- Two infants presented with unilateral hippocampal swelling on MRI following prolonged seizures of temporal origin.
- Serial imaging revealed progression to hippocampal sclerosis in both cases.
Findings:
- Histological examination confirmed hippocampal sclerosis, focal encephalitis sequelae, and microdysgenesis in one infant.
- The second infant exhibited brain dysgenesis with successive acquired hippocampal damage documented by serial MRI.
- These cases demonstrate that hippocampal sclerosis can result from a combination of pre-existing and acquired pathological factors.
Implications:
- These findings expand the understanding of the diverse etiologies leading to hippocampal sclerosis in infants.
- Recognizing combined pathological characteristics is vital for accurate diagnosis and prognosis in pediatric epilepsy cases.
- This research underscores the importance of advanced neuroimaging in diagnosing and monitoring hippocampal damage.
Abstract:
Two infants developed unilateral hippocampal swelling on magnetic resonance imaging after prolonged seizures of temporal origin. Subsequent images suggested hippocampal sclerosis. The first child had febrile status epilepticus with exanthem subitum and developed refractory complex partial seizures. Histological findings after temporal lobectomy confirmed hippocampal sclerosis but also revealed sequelae of a focal encephalitis and microdysgenesis of the hippocampus. The second child had signs of brain dysgenesis, but acquired hippocampal damage affecting each side successively was documented by serial magnetic resonance imaging. These cases illustrate that different clinical conditions combining preexisting and acquired pathological characteristics can lead to hippocampal sclerosis.