Second-look ultrasound scan. The transducer was placed in the sagittal plane, between transverse processes (TPs) of the eighth (T8) and ninth (T9) vertebra. Anechoic fluid in the thoracic paravertebral space (TPVS, black points), (T8) presumably indicating the local anesthetic (LA) spread. TP, transverse process of T8 and T9. The TPVS was located between the hyperechoic lines of the superior costotransverse ligament (SCTL, black arrow and stars) and the pleura.