Familial mesial temporal lobe epilepsy with febrile seizures

Familial mesial temporal lobe epilepsy with febrile seizures (FMTLE with FS) is a rare genetic epilepsy syndrome characterized by the combination of febrile seizures in childhood and subsequent development of mesial temporal lobe epilepsy (MTLE). This condition affects the central nervous system, specifically the mesial (inner) structures of the temporal lobe, including the hippocampus and surrounding areas. It is distinguished from other forms of temporal lobe epilepsy by its clear familial clustering, suggesting a strong genetic component. Affected individuals typically experience febrile seizures during infancy or early childhood, which may later evolve into focal seizures originating from the mesial temporal lobe. These temporal lobe seizures often manifest as episodes of déjà vu, rising epigastric sensations, fear or anxiety, autonomic symptoms, and impaired awareness (previously called complex partial seizures). Some patients may also experience secondary generalization of seizures. The severity of the condition varies considerably within families, with some members experiencing only febrile seizures, others developing temporal lobe epilepsy, and some remaining unaffected. The condition follows an autosomal dominant inheritance pattern with incomplete penetrance, meaning that not all individuals carrying the genetic variant will develop symptoms. Mutations in several genes have been implicated, though the genetic basis is not fully elucidated in all families. Treatment typically involves antiepileptic medications, with many patients responding well to standard anticonvulsant therapy. Commonly used medications include carbamazepine, oxcarbazepine, lamotrigine, and levetiracetam. In cases that are refractory to medical treatment, surgical evaluation may be considered, particularly if hippocampal sclerosis is identified on MRI. The overall prognosis is generally favorable, with many patients achieving good seizure control with appropriate medication.

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