and subcortical white matter in all except
three, in whom these were located in the middle
cerebral arterial territory, aVecting the
frontoparietal cortex in two and the lateral
pontomedullary area in one. The EEG was
abnormal in 33 patients and showed diVuse
background slowing in 22, frontal intermittent
delta activity in 12, and epileptiform discharges
in two. Significant right to left asymmetry was
present in two patients. The MEP was
abnormal in 27 patients. The abnormalities
were present in all four limbs in six, three limbs
in two, two limbs in 15, and one limb in four
patients. The SEP was abnormal in 19 patients;
in all four limbs in six, three limbs in two, two
limbs in six, and one limb in five. Twenty five
patients received metyl prednisolone therapy
whereas 29 did not