1. Copyright © 2013 Lippincott Williams & Wilkins. Unauthorized commercial reproduction of this slide is prohibited Supplemental PowerPoint Slides Variance of Cervical Vertebral Artery Measured by CT Angiography and Its Influence on C7 Pedicle Anatomy Norimitsu Wakao, MD, PhD, *,+ Mikinobu Takeuchi, MD, PhD, * Mitsuhiro Kamiya, MD, PhD, *,+ Masahiro Aoyama, MD, * Atsuhiko Hirasawa, MD, * Keiji Sato MD, PhD, + and Masakazu Takayasu, MD, PhD * From the * Department of Spine Center, Aichi Medical University, Nagakute, Aichi, Japan; + Department of Orthopedic Surgery, Aichi Medical University, Nagakute, Aichi, Japan.

2. In general, the level of the VA entrance into the transverse foramen is assumed to be C6. But the VA anomalies at C7 level surely exist To investigate  Anatomy of VA V2 segment  Anatomical features of C7 pedicle with or without VA entry based on CT angiography in consecutive Japanese 919 subjects The aim of this study

3. Results Total number of subjects: 919 (male:female= 358:561). Average age (mean±SD): 56.1±12.3 (14-91).

4. Results C7 pedicle diameter in 14 cases Without VA With VA