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My father has Parkinson's disease and has had a right side pallidotomy. He new neurologist has suggested that there is evidence that patience who have the second side done are much more likely to have trouble with cognitive skills afterwards. Is there any hard evidence to support this? If so, there must be some "odds" that it can happen. My father is determined to have the second side done unless there is strong evidence against it. The surgery on the right side produced some results, but he did not dramatically improve. Thanks! Brady Graham