The tumors of the brain stem include those of the midbrain, pons, and medulla oblongata. The main purpose of the study was to evaluate the motor system (the motor cortex and pyramidal tract) before and after surgery in patients with brain stem tumors. The study was conducted in 104 patients. In all the patients, motor evoked potentials (MEP) under transcranial magnetic stimulation were recorded before and 2-3 weeks after surgery. Comparing the mean values of MEP indicated a statistically significant decrease in the latent time and the time of central motor conduction, the amplitude of responses being statistically insignificantly changed.
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