Ultrasound guidance for transforaminal percutaneous endoscopic lumbar discectomy may prevent radiation exposure: A case report

Figure 3 Puncture process of the two spinal needles. A: Ultrasound (US)-guided insertion of the two needles; B: Guidewires were then inserted through the two needles; C: US image of one needle (black arrow indicates the tip of the needle; white arrow indicates the track of the needle); D: Position of the needles in the anteroposterior X-ray image; E: Position of the needles in the lateral X-ray image.