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Ictal Single Photon Emission Computed Tomography in Occipital Lobe Seizures |
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| Authors: | Roderick Duncan Amaud Biraben§ James Patterson Donald Hadley† A M Bernard‡ Joseph Lecloirec‡ Jean-Pierre Vignal§ Patrick Chauvel§ |
| Institution: | Departments of Neurology, Institute of Neurological Sciences, Southern General Hospital NHS Trust, Glasgow, Scotland;INSERM CJF 90-12, Clinique Neurologique, Centre Hospitalier Régional et Universitaire de Rennes, Rennes, France;Departments of Clinical Physics, Institute of Neurological Sciences, Southern General Hospital NHS Trust, Glasgow, Scotland;Departments of Neuroradiology, Institute of Neurological Sciences, Southern General Hospital NHS Trust, Glasgow, Scotland;Service de Médecine Nucléaire, Centre Eugène Marquis, France |
| Abstract: | Summary: Purpose: Ictal single photon emission computed tomography (SPECT) has been evaluated as an adjunctive localizing technique in temporal lobe epilepsies and, to a lesser degree, in some extratemporal epilepsies. The purpose of this study was to determine whether occipital lobe seizures are associated with distinctive ictal cerebral blood perfusion (rCP) patterns. Methods : SPECT was used with the tracer Results : Two patterns of rCP were seen. Four patients had hyperperfusion that was restricted to the occipital lobe, and two patients had hyperperfusion of the occipital lobe and the ipsilateral mesial temporal lobe, with hypoperfusion of the lateral temporal lobe. The latter 2 patients had clinical and surface EEG evidence of temporal lobe involvement in the seizure discharge. Conclusions : Ictal rCP patterns in occipital lobe seizures are distinct from those in temporal lobe seizures and may vary according to whether or not ipsilateral temporal lobe structures are involved in the ictal discharge. |
| Keywords: | Ictal Single photon emission computed tomography Occipital Seizures Regional cerebral perfusion |