Fig. 1From: Rhomboid intercostal block versus serratus block for postoperative analgesia after thoracoscopic sympathectomy for primary palmar hyperhidrosis: a randomized controlled trialThe rhomboid block technique: (A) Sonographic anatomy of the layers encountered during rhomboid block. (B) Directing the needle to the plane between intercostal and rhomboid muscles. (C) Spread of the local anesthetic injectate in the proper planeBack to article page