Stereotactic stimulation of the anterior lobe of the cerebellum in cerebral palsy from a suboccipital approach.

The anatomical connections of the anterior lobe of the cerebellum with the reticular formation in the brainstem, upper motor neurons and the limbic system, as well as the results of experimental and clinical observations indicate that this region is a proper area for modulation of certain types of central motor disorders but also of limbic functions. Through a direct stereotacticaly suboccipital approach electrodes were introduced into the anterior lobe of the cerebellum in four patients (3 females and one male, 24, 29, 45 and 19 years old, respectively) suffering from cerebral palsy and being confined to a wheelchair with severe spastic choreoathetoid movements, with minimal hand function, but in good mental state. After a period of test stimulation (up to 10 days), the pulse generators were implanted and chronic high-frequency stimulation was applied (for 37, 58, 9 and 32 months, respectively). In agreement with our previous experience (transtentorial approach in 30 patients), noticeable improvements in spasticity were immediate and a gradual reduction in choreoatetoid movements was observed in the following days to weeks. Improvements in speech, swallowing, respiration, posture, ambulation, and mood states were combined with development of new motor skills. Caution with the proper positioning of the electrode in the target and the selection of optimal program for stimulation are of paramount importance.