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Anatomic view of quadratus lumborum (QL) block (anterior, lateral, and posterior). The lateral QL block injects the local anesthetic at the lateral to the QL muscle. The posterior QL block injects the local anesthetic at the posterior to the QL muscle. The anterior QL block injected the local anesthetic between the PM muscle and the QL muscle. QL: quadratus lumborum muscle, PM: psoas major muscle, and gray line: transversalis fascia.
