Axial diagram of cervical interlaminar epidural injection. The epidural needle is advanced in the midline between spinous processes and traverses the ligamentum flavum to enter the dorsal epidural space in the midline. The normal cervical epidural space is approximately 3 mm wide (from the ligamentum flavum to the dura mater in the axial plane). Note the proximity of the underlying spinal cord during cervical epidural injection. The most common mechanism of injury during cervical epidural steroid injection performed via the interlaminar route is direct needle trauma to the spinal cord. Reproduced, with permission, and modified from original figures, from Rathmell JP: Atlas of Image Guided Intervention in Regional Anesthesia and Pain Medicine, 2nd edition. Philadelphia, Lippincott Williams & Wilkins, 2012. Adaptations are themselves works protected by copyright. So in order to publish this adaptation, authorization must be obtained both from the owner of the copyright in the original work and from the owner of copyright in the translation or adaptation.