[Brain stem auditory evoked potentials in tumors of the posterior parts of the 3d ventricle and pineal gland].

Dynamic studies (one to six times) of stem generated potentials (SGP) to acoustic stimulation were conducted in 32 patients with tumors of the posterior parts of the third ventricle and the pineal gland. In tumors of this localization, the SGP underwent pathological changes in 90% of cases: the response latency increased, its amplitude reduced more or less coarsely (even to complete abaissement of the peaks), and the time intervals between the peaks increased. Dynamic studies of SGP to acoustic stimulation may help the surgeon in making the diagnosis and prove valuable in appraising the functional state of the stem structures in the postoperative period.