20. A patient is positioned prone in the fluoroscopic table, the T1-T4 spinous processes are identified
on the ipsilateral side, and a skin weal is raised 4-5 cm lateral to the spinous process. A spinal
needle is directed to the lamina and “walked” laterally until there is loss of resistance. These
procedures are consistent with which type of block?
(A) Stellate ganglion
(B) Thoracic sympathetic
(C) Interpleural
(D) Thoracic epidural