Cervical transforaminal injection and the radicular artery: variation in anatomical location within the cervical intervertebral foramina.

Background: Recent articles have detailed the adverse events associated with transforaminal steroid injections into the radicular arteries. Guidelines on strict transforaminal epidural techniques have been described to limit complications. There remains limited information regarding the cervical level of entry, location within the intervertebral foramina, and prevalence of the radicular arteries within the population.