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Case illustration of unrecognized, nerve root herniation (case No. 1). A 64-year-old male patient underwent transforaminal percutaneous endoscopic lumbar discectomy (PELD) for right-sided disc herniation at the L4-5 level (a). Four hours later, sudden recurrent leg pain and progressive motor weakness developed. Postoperative MRI showed transdural nerve root herniation into the disc space (b)
