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From: Different Approaches to Ultrasound-guided Thoracic Paravertebral Block:An Illustrated Review Anesthes. 2015;123(2):459-474. doi:10.1097/ALN.0000000000000747 Figure Legend: Ultrasound (US)-guided thoracic paravertebral blocks using a sagittal transducer. (A) Oblique sagittal cross-section at thoracic level T4/T5 at approximately 5 cm lateral of the midline. The superior costotransverse ligament (SCTL) (pink) is highlighted by a dotted outline. (B) Illustration depicting transducer position and needle trajectory for a medial technique with caudolateral to craniomedial angulation (7). The arrow number refers to figure 5. A = anterior; es = erector spinae muscle; I = inferior; in = intercostal nerve; lc = levator costarum muscle; P = posterior; r = rib; rhomb = rhomboid muscle; S = superior; ST = sympathetic trunk; TP = transverse process; trap = trapezius muscle; turquoise = costotransverse blue, and yellow indicate artery, vein, and nerve, Date of download: 5/13/2017 Copyright © 2017 American ligament. Society of Red, Anesthesiologists. All rights reserved. respectively.