title: Deep brain stimulation of a patient with psychogenic movement disorder.
abstract: BACKGROUND
  The long-term safety of deep brain stimulation (DBS) is an important issue because new applications are being investigated for a variety of disorders. Studying instances where DBS was inadvertently implanted in patients without a movement disorder may provide information about the safety of the therapy. We report the case of a patient with a psychogenic movement disorder treated with deep brain stimulation (DBS).
  
  
  METHODS
  The patient presented at our clinic after 5 years of chronic DBS of the subthalamic nucleus (STN) for presumed Parkinson's disease. A dopamine transporter (DAT) scan (DaTscan) showed normal DAT distribution in the striatum. A positron emission tomography (PET) scan showed no abnormal metabolic patterns. Further psychiatric and neurological evaluations revealed that the patient was suffering from a psychogenic movement disorder. The patient displayed no sign or symptom from the stimulation, and DBS did not lead to any benefits or side effects for this patient.
  
  
  CONCLUSIONS
  We argue that the absence of side effects, the normal DaTscan, and PET scan after 5 years of chronic stimulation illustrate the safety of DBS on neural tissue.
authors.affiliation: Neurosurgery, VA Greater Los Angeles Healthcare System, Los Angeles, California, USA; Department of Neurosurgery, University of California Los Angeles, Los Angeles, California, USA.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Langevin
authors.affiliation: Division of Neurosurgery, University of Arizona, Tucson, Arizona, USA.
authors.forename: Jesse M
authors.initials: JM
authors.lastname: Skoch
authors.affiliation: Department of Neurology, University of Arizona, Tucson, Arizona, USA.
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Sherman
keywords: Deep brain stimulation; Parkinson's disease; functional imaging; psychogenic movement disorder