Serial electroencephalographies of the patient without sedation. (A) Recording on day 2 showed background rhythm was taken place by abnormal diffuse low-voltage fast-activities, when patient was alert but with psychiatric symptoms. (B) Recording on day 11 revealed aberrant universal delta activity, when patient was in coma. (C) Recording on day 34 (8th day after teratoma removal) demonstrated the return of background alpha rhythm with few theta activity, when the patient's conscious was recovered without oral-facial dyskinesias or extremities convulsions. (D) Recording on day 44 (18th day after teratoma removal) showed a normal alpha activity. The calibration marks represent 1 second and 100 μV.