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Biportal endoscopy allowed us to improve the working angle by switching the viewing endoscope and the ablation wand. (a) Single-port endoscopy has a limited working angle that restricts operating at the S3 lateral branch and L5 dorsal ramus. (b,c) Biportal endoscopy afforded a more flexible working space by allowing us to exchange the viewing endoscope and the ablation wand.
