title: Jerky periods: myoclonus occurring solely during menses.
abstract: BACKGROUND
  In this case report, we describe an unusual case of a patient with myoclonus only occurring during menses.
  
  
  METHODS
  A 41-year-old female, known to have neurological sequelae after a car accident 1 year earlier, presented with myoclonic movements of the right arm and hand only during menses. Brain magnetic resonance imaging is compatible with head trauma. Electromyography shows brief irregular bursts with a duration of about 20 ms.
  
  
  CONCLUSIONS
  This appears to be the first description of myoclonus appearing only during menses. We suggest a cortical origin for myoclonus.
authors.affiliation: Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Arthur W G
authors.initials: AW
authors.lastname: Buijink
authors.forename: Jeannette M
authors.initials: JM
authors.lastname: Gelauff
authors.forename: Sandra M A
authors.initials: SM
authors.lastname: van der Salm
authors.forename: Marina A J
authors.initials: MA
authors.lastname: Tijssen
authors.forename: Anne-Fleur
authors.initials: AF
authors.lastname: van Rootselaar
keywords: Myoclonus; estrogen; menses; menstrual period