Introduction: Pallister-Killian Syndrome (PKS) (OMIM #601803) is a rare genetic disorder caused by a mosaic tetrasomy of the short arm of chromosome 12. Epilepsy is a frequent concern in PKS patients. Methods: we report 3 PKS patients, with early-onset myoclonic epilepsy and photosensitivity. In these children, we analysed epileptic history and the EEG phenotype. Results: Epilepsy onset was in the first 2 years of life in all patients and in 2 of them myoclonic seizures were the only seizure type. In all children photosensitivity was observed and myoclonic seizures were mainly related to low-frequency (1–6 Hz) intermittent photic stimulation. Levetiracetam was effective and well tolerated in the 2 treated patients. Conclusions: early-onset myoclonic epilepsy is a possible clinical manifestation of PKS. Low-frequency photosensitivity is a peculiar bioelectrical marker in these children.

Myoclonic epilepsy with photosensitivity in infants with Pallister-Killian Syndrome

Ricci E.;Bonfatti R.;Rocca A.;Sperti G.;Cagnazzo V.;Cocchi G.;Cordelli D. M.
2019

Abstract

Introduction: Pallister-Killian Syndrome (PKS) (OMIM #601803) is a rare genetic disorder caused by a mosaic tetrasomy of the short arm of chromosome 12. Epilepsy is a frequent concern in PKS patients. Methods: we report 3 PKS patients, with early-onset myoclonic epilepsy and photosensitivity. In these children, we analysed epileptic history and the EEG phenotype. Results: Epilepsy onset was in the first 2 years of life in all patients and in 2 of them myoclonic seizures were the only seizure type. In all children photosensitivity was observed and myoclonic seizures were mainly related to low-frequency (1–6 Hz) intermittent photic stimulation. Levetiracetam was effective and well tolerated in the 2 treated patients. Conclusions: early-onset myoclonic epilepsy is a possible clinical manifestation of PKS. Low-frequency photosensitivity is a peculiar bioelectrical marker in these children.
Ricci E.; Bonfatti R.; Rocca A.; Sperti G.; Cagnazzo V.; Vignoli A.; Cocchi G.; Cordelli D.M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/711493
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