title: A slow orthostatic tremor of primary origin.
abstract: BACKGROUND
  Orthostatic tremor (OT) is a high-frequency tremor (13-18 Hz) present in the legs when standing. Underlying disease is found in one-third of OT patients.
  
  
  METHODS
  We describe an 86-year-old man with progressive shaking of the legs while standing, which disappears immediately after sitting down or while walking. Polymyography confirmed a tremor of the legs (10-11 Hz) while standing. Magnetic resonance imaging (MRI) and neurologic examination showed no underlying disease.
  
  
  CONCLUSIONS
  Primary OT can appear at a lower frequency of 10-11 Hz.
authors.affiliation: Department of Neurology, St. Antonius Hospital, Nieuwegein, The Netherlands.
authors.forename: Sophie M
authors.initials: SM
authors.lastname: Coffeng
authors.forename: Jorrit I
authors.initials: JI
authors.lastname: Hoff
authors.forename: Selma C
authors.initials: SC
authors.lastname: Tromp
keywords: Orthostatic; tremor