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Intractable seizures from infancy can be associated with dentato-olivary dysplasia
1Department of Neuropathology, Hospital for Sick Children, London, U.K.
Insights
This study identifies a novel neurological disorder in children characterized by severe developmental delay and intractable seizures. Distinctive dentato-olivary dysplasia was observed in all affected individuals, suggesting a new clinical diagnosis.
Area of Science:
- Neurology
- Developmental Pediatrics
- Neuroscience
Background:
- Severe developmental delay and intractable epilepsy are significant challenges in pediatric neurology.
- Early-onset seizures, particularly tonic extensor types, often indicate severe underlying brain dysfunction.
- A
- burst-suppression
- EEG pattern in neonates suggests profound encephalopathy.
Purpose of the Study:
- To describe a novel clinico-pathological entity in children with severe developmental delay and intractable seizures.
- To investigate the neuroanatomical basis of this condition.
- To establish diagnostic criteria for this newly identified nosological entity.
Main Methods:
- Clinical case series of five children with severe developmental delay and intractable epilepsy.
- Detailed neurological examinations and seizure type classification.
- Electroencephalography (EEG) monitoring, including neonatal EEG.
- Metabolic screening and neuroradiological assessments.
- Post-mortem neuropathological examination focusing on cerebellar dentate nuclei and inferior olives.
Main Results:
- All five children presented with severe developmental delay and intractable seizures, with tonic extensor seizures prominent early on.
- Four cases had onset in the neonatal period with severely abnormal EEGs showing a
- burst-suppression
- pattern.
- No consistent metabolic or neuroradiological abnormalities were found.
- A distinctive form of dentato-olivary dysplasia was identified in all cases, characterized by hook-shaped, coarse inferior olives and compact, interconnected dentate nuclei.
Conclusions:
- The consistent clinico-pathological findings represent a novel nosological entity.
- Dentato-olivary dysplasia is a key pathological hallmark of this severe early-onset neurological disorder.
- This discovery may lead to improved diagnosis and understanding of severe developmental encephalopathies.
Abstract:
Five children with severe developmental delay had intractable fits of various types but tonic, often extensor, seizures were prominent from an early stage. Onset was in the neonatal period in 4 cases. EEGs were severely abnormal and showed a "burst-suppression" pattern in the first months of life. There were no metabolic or consistent neuroradiological abnormalities. A distinctive form of dentato-olivary dysplasia was found in all cases. Inferior olives were hook-shaped, coarse and lacking undulations, while dentate nuclei showed a compact arrangement of interconnected islands. The clinico-pathological findings form a novel nosological entity.