Fig. 3From: Percutaneous endoscopic lumbar discectomy: minimally invasive technique for multiple episodes of lumbar disc herniationTwo months later after second PELD: MR images showing down migrated disc herniation at the L3–4 (a and b). After third PELD (c), MR images showing complete removal of herniated disc and catheter of external drainage in the epidural space (d and e)Back to article page