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July 7, 1956


JAMA. 1956;161(10):1002. doi:10.1001/jama.1956.02970100068022

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To the Editor:—  We read with great interest the article by Dr. Cooper and co-workers entitled "Surgical Alleviation of Parkinsonism" (J.A.M.A.160:1444-1447 [April 28] 1956), in which "chemopallidectomy" for treatment of Parkinson tremor is described. Though they speak of nonstereotaxic injection, they use principles quite similar to those described by us previously; namely, a needle guide and an intracranial reference point such as the foramen of Monro. Their apparatus is certainly much simpler than our stereoencephalotome. The question, however, arises whether a too radical simplification does not have certain disadvantages. Our stereoencephalotome has a needle carrier permitting motion of a needle electrode or cannula millimeter by millimeter and angulation degree by degree in every direction, so that one is able to change position and direction of the electrode as it may be necessary in the individual case. This is hardly possible with Dr. Cooper's simplified instrument, except if the

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