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Ictal Single Photon Emission Computed Tomography in Occipital Lobe Seizures
Author(s) -
Duncan Roderick,
Biraben Amaud,
Patterson James,
Hadley Donald,
Bernard A. M.,
Lecloirec Joseph,
Vignal JeanPierre,
Chauvel Patrick
Publication year - 1997
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.1528-1157.1997.tb01472.x
Subject(s) - ictal , epilepsy , single photon emission computed tomography , electroencephalography , occipital lobe , neuroscience , medicine , emission computed tomography , temporal lobe , psychology , nuclear medicine , positron emission tomography
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 99m Tc HMPAO to image ictal rCP in 6 patients in whom clinical, EEG, and imaging data indicated occipital lobe seizures. 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.