[EEG and CAT in astrocytomas grade III-IV (author's transl)]

The relation between C.A.T., EEG, echoencephalography and clinical data was studied in 33 patients with astrocytoma grade III-IV. The diagnostic and localizing possibilities of the EEG were evaluated. The occurrence of EEG signs (focal delta-activity, asymmetry of normal rhythms, frontal intermittent rhythmic delta-activity etc.) was related to the C.A.T.-findings. A prognostic value of the EEG could be established in this group of patients. The results of the A-scan echoencephalography were compared with the midine displacements as shown on the C.A.T. It is pointed out that comparative studies of C.A.T. and EEG are valuable only when clinically homogeneous groups are taken into consideration. The necessity of such studies for a better understanding of the EEG is stressed.