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(A) Fascial space (arrows). The probe in the longitudinal parasagittal orientation (left bottom). (B) The spinal needle advancing from the cephalic to caudal direction using in-plane technique (arrow heads). The needle tip (arrow) located in the target fascial space. (C) Linear spread of the fluid throughout the fascial space (arrows). L3 TP, L3 transverse process; L4 TP, L4 transverse process.
