From the case:
Posterior ponticle - illustration
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/58449/annotated_viewer_json?lang=us"}
A normal variant posterior ponticle of C1 is illustrated, along with the normal course of the vertebral artery at this site
Case Discussion
A posterior ponticle is also often referred to as a: ponticulus posticus, arcuate foramen, or Kimerle anomaly. This finding is typically of no clinical significance.