<unk>  is a neurosurgical procedure. It is used to treat Parkinson's disease and some other conditions, often as an alternative to deep brain stimulation. It involves placing a tiny electrical probe in the globus pallidus, one of the basal ganglia of the brain, to damage it. Unilateral<unk>  can cause side effects including problems with language learning, visuospatial constructional ability, and executive functions. Bilateral<unk>  is not effective, with many severe side effects.
Pallidotomy
Cricopharyngeal myotomy
Ventriculotomy 
Lumbar–peritoneal shunt
Surgical airway management
Positive airway pressure
Cerebrospinal fluid diversion
Craniotomy