000 02403cam a2200349 4500500
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041 _afre
042 _adc
100 1 0 _aSolazzi, Roberta
_eauthor
700 1 0 _a Castellotti, Barbara
_eauthor
700 1 0 _a Canafoglia, Laura
_eauthor
700 1 0 _a Messina, Giuliana
_eauthor
700 1 0 _a Magri, Stefania
_eauthor
700 1 0 _a Freri, Elena
_eauthor
700 1 0 _a Ragona, Francesca
_eauthor
700 1 0 _a Franceschetti, Silvana
_eauthor
700 1 0 _a Di Francesco, Jacopo C.
_eauthor
700 1 0 _a Gellera, Cinzia
_eauthor
700 1 0 _a Granata, Tiziana
_eauthor
245 0 0 _aParoxysmal tonic upgaze in a child with SCN8A-related encephalopathy
260 _c2021.
500 _a58
520 _aPathogenic variants in the SCN8A gene have been associated with a broad phenotypic spectrum, ranging from benign familial infantile seizures to severe, early-onset developmental and epileptic encephalopathy. This spectrum also includes an “intermediate phenotype” characterized by different degrees of cognitive disability, mild neurological impairment, and therapeutically manageable epilepsy. We report on a child harbouring a de novo, novel SCN8A deletion, whose clinical picture is consistent with an SCN8A-related “intermediate phenotype”. This patient's peculiar feature is the occurrence of paroxysmal tonic upgaze (PTU), a non-epileptic disorder consisting of sustained conjugate upward deviation of the eyes, with neck flexion, and downbeat saccades. PTU has been described in otherwise healthy children, as well as in a few genetic syndromes, but has never been observed in SCN8A-related phenotypes. This report, therefore, adds a new symptom to the spectrum of movement disorders associated with SCN8A-related developmental and epileptic encephalopathy. In this short communication, we provide video-EEG documentation of PTU and seizures, and discuss the challenging differential diagnosis between the two symptoms.
690 _aDEE
690 _adevelopmental and epileptic encephalopathy
690 _a-related epilepsy
690 _aparoxysmal tonic upgaze
690 _aparoxysmal movement disorders
690 _aSCN8A
786 0 _nEpileptic Disorders | Vol 23 | 4 | 2021-04-01 | p. 643-647 | 1294-9361
856 4 1 _uhttps://shs.cairn.info/revue-epileptic-disorders-2021-4-page-643?lang=en&redirect-ssocas=7080
999 _c611656
_d611656