[Changes in the EEG in tumors in the area of the 3d ventricle accompanied by a hypersomnic syndrome].

In the majority of patients with brain tumours in the area of the third ventricle and a clinical picture characterized by pronounde somnolence, the background EEG showed, along with typical delta-waves, the spindle-shaped theta-activity the form of bilateral synchronous flashes. It was most prominent at parietal leads. This activity increased sharply during sleep and in the soporous state. These data may be of interest in relation to the problem of sleep pathophysiology and pathology. It is suggested that the presence of this activity in combination with delta-waves may constitute a bad prognostic sign in tumours in the area of the third ventricle.