Fig. 1From: Continuous serratus posterior superior intercostal plane block for postoperative analgesia management in the patient who underwent right atrial mass excision: a case reportSonographic anatomy of SPSIPB and spread of LA are seen. The spread of LA is between the rib and SPSM. The landmarks: TM, RMm, SPSM, 3rd rib, and pleurae are seen in the image. TM; Trapezius muscle, RMm; Rhomboid major muscle, SPSM; Serratus posterior superior muscle, LA; Local anestheticBack to article page