[Electroencephalogram and CAT scan in 393 cases of epilepsy. Consistency between focal EEG changes and focal CAT...

A simultaneous study of EEG recordings and CAT scans in 393 epileptics led to the following findings:--in our population, the EEG pattern is normal in 6.8% of the cases and the CAT normal in 64.6%;--focal EEG changes give focal CAT changes in 38.6% and diffuse changes in 4.1% of the cases;--diffuse EEG changes give focal CAT changes in 18% and diffuse changes in 8.8% of the cases;--focal CAT changes give focal EEG changes in 68% and diffuse changes in 28% of the cases;--diffuse CAT changes give focal EEG changes in 27.5% and diffuse changes in 51.8% of the cases;--out of the 393 epileptics, 72 presented distinctly focal changes on simultaneous EEG and CAT records. The changes were on the same side in 80.5% of the cases. The reasons for the lack of consistency in 19.5% of the cases are discussed.