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The parasagittal approach for ultrasound‑guided anterior quadratus lumborum block at the lateral supra‑arcuate ligament. The sonogram shows the apposition zone of the quadratus lumborum and diaphragm (endothoracic fascia). The lowest edge is the lateral arcuate ligament. The injectate target is the apposition zone between the quadratus lumborum and diaphragm (endothoracic fascia). The embedded graph shows the site of probe.
