Fig. 1From: Ultrasonography of thyroid nodules: a pictorial review(a) Axial view of right thyroid lobe (Th). Isthmus (Is) is anterior to the trachea (Tra). The carotid artery (C) is round and hypo-echogenic located laterally to the thyroid. The internal jugular vein (J) is lateral to the carotid artery. The strap muscle (SM) and sternocleidomastoid muscle (SCM) wrap around the anterior aspect of the thyroid. (b) Longitudinal view of the right thyroid lobeBack to article page