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Rinsho Shinkeigaku. 2019 Mar 28;59(3):144-148. doi: 10.5692/clinicalneurol.cn-001228. Epub 2019 Feb 28.

[An adult female with proline-rich transmembrane protein 2 related paroxysmal disorders manifesting paroxysmal kinesigenic choreoathetosis and epileptic seizures].

[Article in Japanese]

Author information

1
Department of Neurology, Kyoto University Graduate School of Medicine.
2
Present address: Department of Neurology, Osaka Saiseikai Nakatsu Hospital.
3
Department of Epilepsy, Movement Disorders and Physiology, Kyoto University Graduate School of Medicine.
4
Present address: Department of Pediatric Neurology, Osaka City General Hospital.
5
Department of Pediatrics, Kyoto University Graduate School of Medicine.
6
Present address: Department of Anatomy and Developmental Biology, Drug Discovery Department for Skin and Brain Disorders, Kyoto University Graduate School of Medicine.
7
Present address: Department of Pediatrics, Hyogo Prefectural Amagasaki General Medical Center.

Abstract

A 21-year-old woman presented with a chief complaint of generalized tonic-clonic seizures occurring once a month at night since the age of 14. The patient was treated with clonazepam plus levetiracetam, but seizure frequency was not reduced. After the detailed re-examination of her history of illness, it was revealed that she has been suffering from transient and recurrent choreoathetoid attacks triggered by sudden voluntary movements since she was a junior high school student, and it recently increased in frequency. Neither she nor her family recognize that it was significant to describe to the doctors. She was diagnosed as a complex of paroxysmal kinesigenic choreoathetosis (PKC) and its related conditions. Direct sequencing of proline-rich transmembrane protein 2 (PRRT2) revealed the most frequently described gene mutation, (NM_145239.2:c.649dupC), among PRRT2-related paroxysmal disorders. PKC and seizures were readily controlled with small dose of carbamazepine. Given the broad spectrum of PRRT2-related paroxysmal disorders, assessment of potential clinical complication of paroxysmal disorders including PKC might therefore be critical.

KEYWORDS:

epilepsy; generalized tonic-clonic seizure (GTCS); paroxysmal kinesigenic choreoathetosis (PKC); proline-rich transmembrane protein 2 (PRRT2)

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