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Temporal lobe epilepsy in infants and children
1Washington University, Department of Neurology, St. Louis Children's Hospital, MO 63110, USA. bourgeois@kids.wustl.edu
Insights
Temporal lobe epilepsy in infants presents differently than in adults, with distinct clinical and pathological features. Understanding these differences is crucial for accurate diagnosis and treatment in young children.
Area of Science:
- Neurology
- Pediatric Epilepsy
Background:
- Temporal lobe epilepsy (TLE) in adults is well-characterized.
- TLE in infants and young children is increasingly recognized as a distinct clinical-pathological entity.
Purpose of the Study:
- To delineate the unique clinical seizure semiology and neuropathological findings of TLE in infants.
- To differentiate infantile TLE from adult TLE.
Main Methods:
- Clinical observation and semiological analysis of seizures in infants.
- Review of neuropathological findings in infantile TLE cases.
- Comparison with established TLE characteristics in adults and adolescents.
Main Results:
- Infantile TLE seizures exhibit behavioral arrest, lack of aura, orofacial automatisms, prominent convulsive activity, and longer duration (>1 min).
- Mesial temporal sclerosis is rare in infants; common pathologies include dysplasias, migrational disorders, hamartomas, and gangliogliomas.
- Infantile TLE can mimic generalized seizures or present as benign syndromes.
Conclusions:
- Clinical assessment of TLE in infants requires different criteria than in adults due to challenges in evaluating consciousness.
- Neuropathology in infantile TLE is distinct from adults, with developmental abnormalities being more prevalent than mesial temporal sclerosis.
- Further research into the pathogenesis of infantile TLE and mesial temporal sclerosis is warranted.
Abstract:
Temporal lobe epilepsy in adults and adolescents is a fairly homogeneous syndrome, both in terms of seizure semiology and in terms of its pathology, and it has been studied extensively. Temporal lobe epilepsy in infants and young children has begun to receive increasing attention in recent years, and a different clinico-pathological picture has emerged. Clinically, the concept of complex partial seizures, which may be useful in adults, is difficult to apply to infants, since it is often not possible to assess impairment of consciousness in this age group. The main distinctive features of complex partial seizures of temporal lobe origin in infants are (1) a predominance of behavioral arrest with possible impairment of consciousness, (2) no identifiable aura, (3) automatisms that are discrete and mostly orofacial, (4) more prominent convulsive activity, and (5) a longer duration (more than 1 min). In addition, seizures of temporal lobe origin in infants may appear clinically generalized, such as infantile spasms or generalized tonic seizures, or can occasionally represent a benign syndrome. The neuropathological findings of temporal lobe epilepsy in infants differ even more than the clinical seizure semiology. In contrast to adult and adolescent patients, mesial temporal sclerosis is a rare finding in infants, in whom the pathological abnormalities associated with seizures of temporal lobe origin consist mostly of dysplasias, migrational disorders, hamartomas, and low-grade tumors such as gangliogliomas. Mesial temporal sclerosis is seen more often in older children than in infants, and its pathogenesis remains a subject of controversy.