Journal of Pediatric Epilepsy
DOI: 10.1055/s-0043-1771518
Case Report

A Novel Neuroimaging Phenotype in the Pediatric Paroxysmal Kinesigenic Dyskinesia

1   Department of Pediatrics and Pediatric Neurology, Command Hospital, Chandimandir, Panchkula, Haryana, India
Bharat Hosur
2   Department of Radiodiagnosis, Armed Forces Medical College, Pune, Maharashtra, India
Sonali Singh
3   Department of Pediatrics, Institute of Neurosciences, Kolkata, West Bengal, India
Gautam Kamila
4   Division of Child Neurology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
Ankit Kumar Meena
4   Division of Child Neurology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
› Author Affiliations


Paroxysmal kinesigenic dyskinesia (PKD) is a rare disorder characterized by recurrent attacks of hyperkinetic movements which can be isolated or associated with benign infantile seizures as part of the infantile convulsions with choreoathetosis syndrome. We present a case of hyperkinetic movement disorder in the form of choreoathetosis, ballismus, dystonia triggered by sudden movements with a past history of benign infantile convulsions in a 12-year-old girl. The contrast-enhanced brain and spine magnetic resonance imaging showed bilaterally symmetric superior cerebellar cytotoxic edema sparing the vermis with swollen cerebellar foliae. Whole-exome sequencing identified a homozygous frameshift duplication NM_145239.3(PRRT2):c.649dupC(p.Arg217Profs*8) in the PRRT2 gene. This case report highlights the frameshift duplication in the PRRT2 gene and rare neuroimaging findings which further expand the phenotypic characteristics of PKD in children.

Author Contribution

R.S. was responsible for conceptualization. R.S. and B.H. were responsible for data curation. R.S. was responsible for formal analysis. S.S. was responsible for methodology. G.K. was responsible for visualization. R.S., S.S., A.M., and B.H. were responsible for writing review and editing.

Publication History

Received: 06 May 2023

Accepted: 02 July 2023

Article published online:
02 August 2023

© 2023. Thieme. All rights reserved.

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