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Ultrasound-guided SC-AQLB with a low-frequency probe. A: Pre-nerve block image. B: Post-nerve block image. Notes: T12 rib = 12th rib, QLM = quadratus lumborum muscle, LD = Latissimus dorsi, TF = transversalis fascia, LA = local anesthetic. White arrow indicates the nerve block needle insertion. SA-AQLB: Anterior quadratus lumborum block at the lateral supra-arcuate ligament; SC-AQLB: subcostal anterior quadratus lumborum block.
