title: An unusual variation of carotid-vertebrobasilar arteries: An anatomical case report.
abstract: OBJECTIVE
  Having no obvious clinical symptoms and signs, it is difficult to find head and neck vascular variations without the aid of vascular imaging techniques.
  
  
  METHODS
  A 66-year-old female patient underwent head and neck computed tomographic angiography examination. Her computed tomographic angiography examination revealed that the internal carotid artery directly migrated to the ophthalmic artery. Brain blood supply is provided by the vertebrobasilar artery independently.
  
  
  CONCLUSIONS
  To the best of the author's knowledge, this is a very rare anatomical vascular variation of the head and neck found by computed tomographic angiography.
authors.affiliation: Department of Radiology, First Affiliated Hospital of Bengbu Medical College, People's Republic of China sskuijlp@163.com.
authors.forename: Shi-Kui
authors.initials: SK
authors.lastname: Shi
mesh_terms: D000368:Aged; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging* / Q000473:pathology; D000072226:Computed Tomography Angiography; D005260:Female; D006801:Humans; D014715:Vertebrobasilar Insufficiency / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: Anatomical variation; carotid artery; computed tomography angiography; vertebrobasilar artery