Ultrasonography imaging of the left stellate ganglion & prevertebral fascia (asterisks). Needle was advanced with real-time ultrasonography so that the needle tip will lie anterior to the longus coli. Th: Thyroid, LCo: Longus coli muscle, LCp: Longus capitus muscle, CA: Carotid artery, SCM: Sternocleidomastoid muscle, TP: Transverse process.