Ictal SPECT hyperperfusion reflects the activation of the symptomatogenic cortex in spontaneous and electrically-induced non-habitual focal epileptic seizures: correlation with subdural EEG recordings.
We report a patient with left temporal lobe epilepsy and a left parietal angioma, in whom ictal SPECT showed hyperperfusion in a spontaneous and an electrically-induced, non-habitual focal seizure. A SPECT investigation during an habitual seizure originating in the left temporal lobe showed a left temporal hyperperfusion. Electrical stimulation of the parietal cortex adjacent to the location of a previously resected angioma using subdural electrodes resulted in a non-habitual seizure beginning with a unilateral somatosensory aura. Ictal SPECT of this seizure demonstrated contralateral central hyperperfusion. We conclude from our findings that ictal SPECT hyperperfusion reflects the activation of symptomatogenic cortex, which can be induced by both epileptic discharge and electrical stimulation.
Department of Neurology, University of Munich, Germany. Steph.Arnold@gmx.de
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S
Arnold
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Noachtar
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Linke
K J
KJ
Werhahn
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Yousry
P A
PA
Winkler
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Tatsch
D000328:Adult; D002540:Cerebral Cortex / Q000098:blood supply* / Q000000981:diagnostic imaging*; D002560:Cerebrovascular Circulation / Q000502:physiology; D004558:Electric Stimulation; D004569:Electroencephalography; D004828:Epilepsies, Partial / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D013702:Temporal Lobe / Q000098:blood supply* / Q000000981:diagnostic imaging*; D015899:Tomography, Emission-Computed, Single-Photon