Welcome to Health care magic. During the thyroid scan its mandatory to see the adjacent structures, Look for any lymph nodal enlargement ( as inflammation of the thyroid gland, infections gives enlarged lymph nodes), at the same time if there are nodules, mass lesions - its mandatory to see its extensions and relation to the adjacent structures. During one will always check for lymph nodes, vessels, muscular structures and there condition. Its not possible to see in to throat - as throat contains air and in presence of air ultrasound can t see any thing. Hope it helps you. Wish you a good health. Anything to ask ? do not hesitate. Thank you.