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A rare monogenic disease with infantile-onset pharmacoresistant focal seizures of mesial temporal lobe onset manifesting with unresponsiveness, hypertonia and automatisms and cognitive regression soon after seizure onset leading to severe intellectual disability with behavioral abnormalities.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for infantile-onset mesial temporal lobe epilepsy with severe cognitive regression.
2 publications have been identified in PubMed for infantile-onset mesial temporal lobe epilepsy with severe cognitive regression. Research spans Review / Meta-Analysis (50%) and Epidemiology / Natural History (50%).
Clayton LM (2025). [PMID: 40381056](https://pubmed.ncbi.nlm.nih.gov/40381056/). *Current neurology and neuroscience reports*. [Review / Meta-Analysis]
Eriksson MH (2024). [PMID: 38643018](https://pubmed.ncbi.nlm.nih.gov/38643018/). *Brain : a journal of neurology*. [Epidemiology / Natural History]
Data assembled from 3 of 12 sources · Last updated Sep 20, 2026, 6:06 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center