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Department of Neurology, Division of Neurosurgery, University of California, Los Angeles, CA.(Drs. Risinger, Engel, Van Ness, and Henry)
Department of Surgery, Division of Neurosurgery, University of California, Los Angeles, CA. (Dr. Crandall)
We assessed the reliability and accuracy of scalp/sphenoidal recordings for ictal localization by retrospectively analyzing 706 noninvasive ictal recordings from 110 patients who subsequently underwent stereoencephalographic evaluation. Strictly defined unilateral temporal/sphenoidal ictal patterns correctly predicted findings of depth electrode examination in 82 to 94% of cases. These strictly defined predictive patterns could be detected with excellent interrater reliability. The patterns are misleading in only a minority of cases, but cannot be used in isolation for definite ictal localization.
Address correspondence and reprint requests to Dr. Risinger, Department of Neurology, Indiana University School of Medicine, 702 Bamhill Drive, Indianapolis, IN 46202.
Received November 2, 1988. Accepted for publication in final form April 20, 1989.
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