Lumbar transforaminal injection and use of digital subtraction to identify intraarterial needle location. (A) Anterior–posterior radiograph of the lumbar spine with the needle is in final position for right L4/L5 transforaminal injection. (B) Lateral radiograph of the lumbar spine with the needle is in final position for right L4/L5 transforaminal injection. (C) Anterior–posterior radiograph of the lumbar spine with the needle is in final position for right L4/L5 transforaminal injection acquired during active injection of radiographic contrast demonstrating intraarterial contrast injection. (D) Same image shown in C as seen using digital subtraction imaging. 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.