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Acute encephalopathy with biphasic seizures and late reduced diffusion (AESD) is a rare childhood-onset epilepsy syndrome associated with infection and characterized by a biphasic clinical course. The initial symptom is a prolonged febrile seizure on day 1 (the first phase). Afterwards, patients have variable levels of consciousness from normal to coma. Irrespective of the consciousness levels, magnetic resonance imaging (MRI) during the first 2 days shows no abnormality. During the second phase (usually days 4 - 6), patients show a cluster of seizures and deterioration of consciousness. Diffusion-weighted images (DWI) on MRI reveal the brain lesions with reduced diffusion predominantly in the subcortical white matter. After the second acute phase, consciousness levels improve with the emerging focal neurological signs. Neurological outcomes of AESD vary from normal to mild or severe sequelae including cerebral atrophy, mental retardation, paralysis and epilepsy.
Biomarker and diagnostic research for acute encephalopathy with biphasic seizures and late reduced diffusion has been reported in the published literature.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for acute encephalopathy with biphasic seizures and late reduced diffusion.
30 publications have been identified in PubMed for acute encephalopathy with biphasic seizures and late reduced diffusion. Research spans Epidemiology / Natural History (30%), Case Report / Case Series (23%), and Basic Science / Preclinical (17%).
Research Type | Count | % of Total |
|---|---|---|
Disease patterns and progression | 9 | 30% |
Data assembled from 3 of 12 sources · Last updated Sep 19, 2026, 1:13 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about acute encephalopathy with biphasic seizures and late reduced diffusion
Patient case studies |
7 |
23% |
Laboratory research | 5 | 17% |
Testing and diagnosis research | 4 | 13% |
Clinical study results | 3 | 10% |
Other research | 1 | 3% |
Research summaries | 1 | 3% |
Kawano G (2026). [PMID: 42056533](https://pubmed.ncbi.nlm.nih.gov/42056533/). *Pediatr Res*. [Clinical Trial Publication]
Shin J (2026). [PMID: 41677832](https://pubmed.ncbi.nlm.nih.gov/41677832/). *Pediatric radiology*. [Diagnostic / Biomarker]
Fukuoka M (2026). [PMID: 41604996](https://pubmed.ncbi.nlm.nih.gov/41604996/). *Journal of the neurological sciences*. [Epidemiology / Natural History]
Asahara R (2026). [PMID: 41722127](https://pubmed.ncbi.nlm.nih.gov/41722127/). *Brain & development*. [Diagnostic / Biomarker]
Al Zehra F (2026). [PMID: 42096793](https://pubmed.ncbi.nlm.nih.gov/42096793/). *J Neurol Sci*. [Other]
Kawamura Y (2026). [PMID: 41816002](https://pubmed.ncbi.nlm.nih.gov/41816002/). *Open forum infectious diseases*. [Basic Science / Preclinical]
Nagara S (2026). [PMID: 41810849](https://pubmed.ncbi.nlm.nih.gov/41810849/). *Congenital anomalies*. [Case Report / Case Series]
Sakuma H (2025). [PMID: 39143740](https://pubmed.ncbi.nlm.nih.gov/39143740/). *Developmental medicine and child neurology*. [Clinical Trial Publication]
Jayaramu S (2025). [PMID: 40529980](https://pubmed.ncbi.nlm.nih.gov/40529980/). *The Indian journal of radiology & imaging*. [Case Report / Case Series]
Shahid S (2025). [PMID: 40961742](https://pubmed.ncbi.nlm.nih.gov/40961742/). *Brain & development*. [Epidemiology / Natural History]