[Electroencephalographic findings in tumors of ventricles I-III].

The EEG findings in 177 patients with mainly malignant tumours in the region of the ventricles I-III have been evaluated. The changes were dependent upon the size of the tumours and the kind and direction of their infiltration growth into the paraventricular structure. In case of purely intraventricular spreading of the disturbance of the cerebral fluid circulation normal curves were found. In processes of the third ventricle we found to a greater extent theta-delta paroxysms whereas tumours in lateral ventricles rather caused localised disturbances in the sense of focal findings. Tumours with a growth in a basal direction frequently showed sw-patterns or steep waves. General changes only occurred in an advanced stage of the disease as an expression of the intracranial increase of the pressure.