Figure 6

Computed tomography (CT) images of spreading patterns of the contrast medium in ultrasound-guided capsule-sheath space block (CSSB) combined with anterior cervical cutaneous nerves block (CCNB). CT scan was respectively obtained at the level of upper pole (A), middle of the lobes (B), lower pole (C), and cervical region VI (D) in a 35-yr-old female volunteer. It demonstrated that the injectate spread along bilateral SCM muscles in superficial compartment. Likewise, the injectate in capsule-sheath space could spread up to the upper pole and down to the lower pole and even lower region VI. Furthermore, contrast medium reached the posterior aspect of the two poles. 1, sternocleidomastoid muscle; 2, thyroid gland; 3, trachea; 4, external jugular vein.