A and B, Anteroposterior (A) and lateral (B) radiographs after contrast injection. A and B, Anteroposterior (A) and lateral (B) radiographs after contrast.

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Presentation transcript:

A and B, Anteroposterior (A) and lateral (B) radiographs after contrast injection. A and B, Anteroposterior (A) and lateral (B) radiographs after contrast injection. The needle is positioned centrally within the dorsal epidural space using technique 1 or 2; the contrast material is seen circumferentially within the epidural space and along the proximal nerve sheaths (arrows). fig 3. Schematic representation of needle placement and orientation relative to osseous structures. The needle is aligned with the X-ray beam and is seen en face at fluoroscopy 15° to 20° off midline. A 22-gauge epidural needle is passed in a coaxial fashion through the 18-gauge introducer needle and into the dorsal epidural space at the midline. Anteroposterior and lateral fluoroscopy is used to confirm midline needle tip position in the dorsal epidural space. Blake A. Johnson et al. AJNR Am J Neuroradiol 1999;20:697-705 ©1999 by American Society of Neuroradiology