Fig. 3From: Treatment of L5 - S1 intervertebral disc herniation with posterior percutaneous full-endoscopic discectomy by grafting tubes at various positions via an interlaminar approachMale 45 years old, S1 nerve root shoulder-type disc herniation (shoulder type). a. The preoperative magnetic resonance suggested an obvious prolapse of the disc. b. Image of the inserted expansion cannula. c. Disc herniation and the relaxation of the nerve root after decompression were observed intraoperatively. d. A postoperative review by magnetic resonance shows the complete removal of the protruding discBack to article page