Anomalous vertebral arteries in the extra- and intraosseous regions of the craniovertebral junction visualized by 3-dimensional computed tomographic angiography: analysis of 100 consecutive surgical cases and review of the literature.
Yamazaki M, Okawa A, Furuya T, Sakuma T, Takahashi H, Kato K, Fujiyoshi T, Mannoji C, Takahashi K, Koda M.
Spine (Phila Pa 1976). 2012 Oct 15;37(22):E1389-97. doi: 10.1097/BRS.0b013e31826a0c9f.