Ultrasound (US)-guided epidural injection. Make it sagittal scanning of the sacrum at the sacral hiatus level through US-guided caudal epidural injection. Note the hyperechoic sacrococcygeal ligament (arrow) and the block needle (star) that has been inserted in the epidural space using in-plane technique above the coccyx (block arrow) and the sacral cornu (arrow head) to the left of the screen.