Ring chromosome 20 syndrome: electroclinical description of six patients and review of the literature.

Iris Elens, Katrien Vanrykel, Liesbeth De Waele, Katrien Jansen, Merel Segeren, Wim Van Paesschen, Berten Ceulemans, Marc Boel, Jean-Pierre Frijns, Gunnar Buyse, Lieven Lagae

Department of Paediatric Neurology, University Hospital Leuven, Belgium.

Epilepsy & behavior : E&B 2012 Apr

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Ring chromosome 20 syndrome is a rare chromosomal disorder. In six patients, we focused on the presenting epileptic phenotype, the behavioral and mental problems and the relationship between the ratio of mosaicism and the age at onset of the epilepsy. All patients presented with pharmacoresistant frontal lobe complex partial seizures. The earliest onset of epilepsy was seen in patients without mosaicism. There were three patients out of six with behavioral disturbances before the onset of seizures. All patients had mild to moderate cognitive impairment. Electroencephalogram recordings showed rhythmic theta waves with frontal predominance and non-convulsive status epilepticus (NCSE). The ring chromosome 20 syndrome is characterized by childhood-onset refractory epilepsy continuing throughout adult life, mental disability, and behavioral disturbances which can originate before seizure onset. Ictal EEG reveals a unique pattern. Our findings indicate a possible link between the percentage of affected cells and the age of epilepsy onset. Copyright © 2012 Elsevier Inc. All rights reserved.

Citation

Iris Elens, Katrien Vanrykel, Liesbeth De Waele, Katrien Jansen, Merel Segeren, Wim Van Paesschen, Berten Ceulemans, Marc Boel, Jean-Pierre Frijns, Gunnar Buyse, Lieven Lagae. Ring chromosome 20 syndrome: electroclinical description of six patients and review of the literature. Epilepsy & behavior : E&B. 2012 Apr;23(4):409-14