Fig. 6.
Posterior–anterior view of the cervical spine during C7/T1 transforaminal injection, including a digital subtraction sequence after contrast injection. An anteroposterior view of an angiogram obtained after injection of contrast medium before planned transforaminal injection of corticosteroids. (A) Image as seen on fluoroscopy. The needle lies in the left C7/T1 intervertebral foramen. Contrast medium outlines the spinal nerve (large arrow). The radicular artery appears as a thin tortuous line of contrast passing medially from the site of injection (small arrow). (B) Digital subtraction imaging reveals that the radicular artery (small arrow) extends to the midline to join the anterior spinal artery and much of the contrast is located in the correct location surrounding the spinal nerve (large arrow). Reprinted from Rathmell JP. Anesthesiology 2004; 100:1595–600.24