title: Distal migration of a floating carotid thrombus in a patient using oral contraceptives: a case report.
abstract: BACKGROUND
  We report the case of a patient with distal migration of a floating carotid thrombus caused by oral contraceptives.
  
  
  METHODS
  A 48-year-old woman using oral contraceptives suffered from dysarthria and gait disturbance. Examinations, including ultrasound and cerebral arteriogram, revealed a floating thrombus at the left carotid bifurcation with no stenosis. Despite antithrombotic therapy, the floating carotid thrombus migrated to the ipsilateral middle cerebral artery, resulting in a severe stroke.
  
  
  CONCLUSIONS
  Some floating thrombi are resistant to conservative therapy and have a risk of distal migration, which may cause a major stroke in the acute stage.
authors.forename: Masaki
authors.initials: M
authors.lastname: Watanabe
authors.forename: Takahisa
authors.initials: T
authors.lastname: Mori
authors.forename: Keisuke
authors.initials: K
authors.lastname: Imai
authors.forename: Hajime
authors.initials: H
authors.lastname: Izumoto
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Hirano
authors.forename: Makoto
authors.initials: M
authors.lastname: Uchino