Quest for the Elusive Mechanism of Action for the Thoracic Paraspinal Nerve Block Techniques. Are We Ignoring the Anatomy of the “Retro Superior Costotransverse Ligament Space?”

Retro superior costotransverse ligament space block as an effective analgesia after laparoscopic gastrectomy -a case report-

“…Additionally, the proximal part of the ventral ramus travels within the space [ 6 ]. This space consists of fat and loose connective tissue, appearing as a hypoechoic structure on ultrasound imaging [ 7 ] ( Fig. 1 ).…”