title: Delayed-onset cerebellar syndrome.
abstract: BACKGROUND
  Delayed-onset involuntary movements, including dystonia and myoclonus, have been reported after stroke or head trauma. Moreover, there have been reports of delayed-onset isolated intention tremor and, in several of these cases, gait ataxia.
  
  
  OBJECTIVE
  To further define the clinical features of a delayed-onset cerebellar syndrome.
  
  
  METHODS
  Subjects with cerebellar tremor and either head trauma or stroke were identified using a computerized database, providing detailed demographic and clinical information of 4002 patients with involuntary movements other than Parkinson's disease seen at our center between 1983 and 1995. Medical records and videotaped neurological examinations were retrospectively reviewed.
  
  
  METHODS
  The Center for Parkinson's Disease and Other Movement Disorders at Columbia-Presbyterian Medical Center, New York, NY.
  
  
  METHODS
  Five patients with delayed-onset cerebellar syndromes.
  
  
  RESULTS
  Five patients with stroke or head trauma developed a cerebellar syndrome 3 weeks to 2 years after the initial insult. The syndrome, characterized by intention tremor, ataxic dysarthria, nystagmus, dysmetria, dysdiadochokinesis, and gait ataxia, was progressive in at least one patient. In four patients, lesions were present on neuroimaging in the thalamus or brain stem (especially in the midbrain).
  
  
  CONCLUSIONS
  A delayed-onset cerebellar syndrome may follow head trauma or stroke. The syndrome is sometimes progressive and often disabling. The delayed onset implies that the syndrome is not caused by the initial lesion itself but may be caused by development of post-synaptic supersensitivity or secondary reorganization of involved pathways.
authors.affiliation: Department of Neurology, Columbia University College of Physicians and Surgeons, New York, NY, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Louis
authors.forename: T
authors.initials: T
authors.lastname: Lynch
authors.forename: B
authors.initials: B
authors.lastname: Ford
authors.forename: P
authors.initials: P
authors.lastname: Greene
authors.forename: S B
authors.initials: SB
authors.lastname: Bressman
authors.forename: S
authors.initials: S
authors.lastname: Fahn
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001488:Basilar Artery; D001921:Brain / Q000473:pathology*; D002531:Cerebellum / Q000473:pathology*; D002543:Cerebral Hemorrhage / Q000473:pathology / Q000503:physiopathology*; D006259:Craniocerebral Trauma / Q000473:pathology / Q000503:physiopathology*; D004421:Dystonia / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002532:Intracranial Aneurysm / Q000473:pathology / Q000503:physiopathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D009069:Movement Disorders / Q000209:etiology* / Q000473:pathology; D009207:Myoclonus / Q000209:etiology; D013997:Time Factors