Writing epilepsy: a neurophysiological, neuropsychological and neuroimaging study.
Writing epilepsy is a rare reflex syndrome in which seizures are triggered by writing. We describe a 33-year-old, right-handed man, with a history of juvenile absence epilepsy in remission and a family history of epilepsy, in whom myoclonic jerks precipitated exclusively by writing started at the age of 30. Intensive video/EEG monitoring during neuropsychological tests revealed, at about 1 minute after starting to write, a dystonic posture, followed by myoclonic jerks involving the right hand that shortly after became generalized. Concomitantly, the ictal EEG documented generalized hypersynchronous polyspike-wave discharges, maximal over the right parietocentral area. SPECT revealed an ictal hyperperfusion and interictal hypoperfusion over right parietofrontal regions, and fMRI showed extensive and intense left frontal, supplementary motor area activation, induced by writing. This case study provides some evidence supporting the hypothesis that the mechanism underlying writing-triggered seizures may be a generalized seizure process, with a focal cortical trigger zone, presumed to be the left frontal lobe as suggested by clinical and fMRI data. A relevant role played by the right hemisphere (right parietofrontal region) is postulated in the full-blown expression of reflex epileptogenesis, as supported by EEG and SPECT findings.
Abreu
Pedro
P
Department of Neurology, Hospital S. João, Porto, Portugal. pmabreu@portugalmail.pt
Ribeiro
Mendes
M
Forni
Alessandra
A
Pires
Isabel
I
Sousa
Georgina
G
D000328:Adult; D001931:Brain Mapping; D003952:Diagnostic Imaging / Q000379:methods; D004569:Electroencephalography / Q000379:methods; D004827:Epilepsy / Q000473:pathology / Q000503:physiopathology / Q000523:psychology; D005625:Frontal Lobe / Q000098:blood supply / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009482:Neurophysiology / Q000379:methods; D009483:Neuropsychological Tests; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods; D014956:Writing