Advertisement

Incidence of unilateral distal vertebral artery aplasia: evaluation by combining basiparallel anatomic scanning-magnetic resonance imaging (BPAS-MRI) and magnetic resonance angiography

  • Kohei Morimoto
  • Morio Nagahata
  • Shuichi Ono
  • Hiroyuki Miura
  • Fumiyasu Tsushima
  • Hiroko Seino
  • Shinya Kakehata
  • Kiyoshi Basaki
  • Seiyu Uno
  • Yoshinao Abe
Original Article

Abstract

Purpose

The incidence of a unilateral aplastic distal vertebral artery (VA) has been reported as 0.2% of cases on cerebral angiography. During our daily magnetic resonance (MR) examinations, however, we frequently encounter MR angiograms (MRAs) that do not demonstrate unilateral VA. The purpose of this study was to calculate the frequency of aplastic unilateral distal VA by MR images performed for asymptomatic people.

Materials and methods

Over a time span of 1 year, 237 asymptomatic people (140 men, 97 women; ages 28–67 years, mean 54.4 years) underwent brain MRI during a “brain check-up examination” in our hospital. To identify an aplastic unilateral distal VA, we retrospectively compared three-dimensional time-of-flight MRA with basiparallel anatomic scanning (BPAS)-MRI which was designed for recognition of the arterial outer contour.

Results

Aplasia of the unilateral distal VA was confirmed in 11 persons (4.6%). According to our classification, hypoplastic distal VA in 12 (5.1%) and asymptomatic acquired unilateral distal VA occlusion was also proved in 2 (0.8%).

Conclusion

We found that the frequency of aplastic unilateral VA was 4.6% in asymptomatic people using a combination of MRA and BPAS-MRI for assessment of an intracranial VA.

Key words

MR angiography Cerebral vessels Vertebrobasilar system 

References

  1. 1.
    Morris L. Non-union of the vertebral arteries. Br J Radiol 1962;35:496–498.CrossRefPubMedGoogle Scholar
  2. 2.
    Newton TH, Mani RL. The vertebral artery. In: Newton TH, Potts DG, editors. Radiology of the skull and brain: angiography. Vol. 2, Book 2. St. Louis: Mosby; 1974. p. 1659–1709.Google Scholar
  3. 3.
    Nagahata M, Hosoya T, Adachi M, Kondo R, Manabe H, Hasegawa S. Basi-parallel anatomical scanning (BPAS) MRI: a simple MRI technique for demonstrating the surface appearance of the intracranial vertebrobasilar artery. Nippon Igaku Hoshasen Gakkai Zasshi 2003;63:582–584.PubMedGoogle Scholar
  4. 4.
    Nagahata M, Abe Y, Ono S, Hosoya T, Uno S. Surface appearance of the vertebrobasilar artery revealed on basiparallel anatomic scanning BPAS-MR imaging: its role for brain MR examination. AJNR Am J Neuroradiol 2005;26:2508–2513.PubMedGoogle Scholar
  5. 5.
    Touboul PJ, Bousser MG, LaPlane D, Castaigne P. Duplex scanning of normal vertebral arteries. Stroke 1986;17:921–923.PubMedGoogle Scholar
  6. 6.
    Park J, Kim J, Roh J. Hypoplastic vertebral artery: frequency and associations with iscaemic stroke territory. J Neurol Neurosurg Psychiatry 2007;78:954–958.CrossRefPubMedGoogle Scholar
  7. 7.
    Jeng JS, Yip PK. Evaluation of vertebral artery hypoplasia and asymmetry by color-coded duplex ultrasonography. Ultrasound Med Biol 2004;30:605–609.CrossRefPubMedGoogle Scholar
  8. 8.
    Hosoya T, Watanabe N, Yamaguchi K, Kubota H, Onodera Y. Intracranial vertebral artery dissection in Wallenberg syndrome. AJNR Am J Neuroradiol 1994;15:1161–1165.PubMedGoogle Scholar
  9. 9.
    Hosoya T, Adachi M, Yamaguchi K, Haku T, Kayama T, Kato T. Clinical and neuroradiological features of intracranial vertebrobasilar artery dissection. Stroke 1999;30:1083–1090.PubMedGoogle Scholar
  10. 10.
    Yoshimoto Y, Wakai S: Unruptured intracranial vertebral artery dissection: clinical course and radiographic imagings. Stroke 1997;28:370–374.PubMedGoogle Scholar
  11. 11.
    Nakagawa K, Touho H, Morisako T, Osaka Y, Tatsuzawa K, Nakae H, et al. Long-term follow-up study of unruptured vertebral artery dissection: clinical outcomes and serial angiographic findings. J Neurosurg 2000;93:19–25.CrossRefPubMedGoogle Scholar
  12. 12.
    Naito I, Iwai T, Sasaki T. Management of intracranial vertebral artery dissections initially presenting without subarachnoid hemorrhage. Neurosurgery 2002;51:930–938.CrossRefPubMedGoogle Scholar

Copyright information

© Japan Radiological Society 2009

Authors and Affiliations

  • Kohei Morimoto
    • 1
  • Morio Nagahata
    • 1
  • Shuichi Ono
    • 1
  • Hiroyuki Miura
    • 1
  • Fumiyasu Tsushima
    • 1
  • Hiroko Seino
    • 1
  • Shinya Kakehata
    • 1
  • Kiyoshi Basaki
    • 1
  • Seiyu Uno
    • 2
  • Yoshinao Abe
    • 1
  1. 1.Department of Radiology and Radiation OncologyHirosaki University Graduate School of MedicineHirosakiJapan
  2. 2.Department of RadiologyKuroishi City HospitalKuroishiJapan

Personalised recommendations