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A 53-year-old male patient presented with right-sided leg pain. (A, B) The axial and oblique T2-weighted magnetic resonance (MR) images show extraforaminal entrapment of the L5 nerve root with disc protrusion (black arrows). This patient was treated by a unilateral biportal endoscopic approach. (C, D) The postoperative MR images reveal complete decompression of the L5 nerve root after unilateral biportal endoscopic surgery (black arrowheads).
