[The psychopathology of tumors of the 3rd cerebral ventricle].

36 patients with tumors of diencephalic region of different histologic nature involving cavity of the third ventricle of the brain were observed. 27.7% of the patients had disorders of mental and physical development from the very first years of life. In presurgical period there was a wide spectrum of paroxysmal and permanent mental disorders from asthenia to rude disturbances of memory and consciousness which regressed or disappeared after the operation. The correlation was observed between such disorders, histologic structure and location of the tumor; individual characteristics of the patient (age, dextrality, sinistrality); scope and character of the operation (approach to the tumor, surgical interventions on the structures of the third ventricle).