Figure 1
EEG recorded while awake during the initial stages of illness. Irregular delta slow wave activity is observed over the right hemisphere, particularly over the parasagittal row of electrodes (arrow). Clinically, the patient had chorea of her left upper limb and both lower limbs (A).
A second EEG recorded four weeks into her illness. There is more marked slow wave activity over the entire right hemisphere (arrows) (B).