Although abnormal cerebral edema was seen in all the patients during their clinical courses, 5 patients appeared normal or only slightly edematous as revealed on their brain CT scans upon admission. On the initial EEG, multi-focal paroxysmal discharges were seen in 4 patients, and low-amplitude patterns were seen in 4 other patients. The CSF cell counts were within a normal range in 7 patients, while the serum level of IL-6 and soluble IL-2 receptors increased with varying ranges in all the patients ( Table 4 ).