title: Classification of vertebral artery loop formation and association with cervicogenic dizziness.
abstract: OBJECTIVE
  An examination was conducted of the number, level, clinical association and treatment approaches for vertebral arterial loop formation in patients with this condition with and without concurrent cervicogenic dizziness, and classified them according to the vertebral artery segment in which it was present.
  
  
  METHODS
  A cross-sectional retrospective study.
  
  
  RESULTS
  Thirty-seven patients who had undergone double-sided magnetic resonance angiography were examined; vertebral arterial loop formation was observed at only 1 level in 26 patients and at several levels in 9 patients. Segment one (V1) was involved in 78.3 per cent of cases and segment two (V2) was involved in 21.6 per cent. Symptoms in patients with vertebral arterial loop formation included: positional vertigo, in 100 per cent; and pulsatile tinnitus, in 83.7 per cent.
  
  
  CONCLUSIONS
  Loop formation at the vertebral artery was observed most often on the proximal side in patients with cervicogenic dizziness (78.3 per cent). The incidence on the left side was twice as high as on the right side.
authors: Department of Otorhinolaryngology,Faculty of Medicine,Bezmialem Vakif University,Fatih,Istanbul,Turkey.
authors: A
authors: A
authors: Yenigun
authors: Neurosurgery Clinic,Konya Hospital,Turkey.
authors: M E
authors: ME
authors: Ustun
authors: Department of Otorhinolaryngology,Faculty of Medicine,Bezmialem Vakif University,Fatih,Istanbul,Turkey.
authors: S
authors: S
authors: Tugrul
authors: Department of Otorhinolaryngology,Faculty of Medicine,Bezmialem Vakif University,Fatih,Istanbul,Turkey.
authors: R
authors: R
authors: Dogan
authors: Department of Otorhinolaryngology,Faculty of Medicine,Bezmialem Vakif University,Fatih,Istanbul,Turkey.
authors: O
authors: O
authors: Ozturan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging*; D003430:Cross-Sectional Studies; D004244:Dizziness / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D009759:Nystagmus, Pathologic; D009760:Nystagmus, Physiologic; D011859:Radiography; D012189:Retrospective Studies; D014012:Tinnitus / Q000000981:diagnostic imaging*; D014711:Vertebral Artery / Q000002:abnormalities / Q000000981:diagnostic imaging*; D014717:Vertigo / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: Dizziness; Magnetic Resonance Angiography; Vertebral Artery; Vertigo