The superior thyroid vein is a venous blood vessel that drains the thyroid gland. It emerges at the upper anterior aspect of the thyroid lobe. The main trunk of the superior thyroid vein arises from the confluence of several smaller veins that form a venous network around the thyroid gland called the thyroid venous plexus. Usually, each person has two superior thyroid veins. Moreover, variations showing two thyroid veins instead of one on each side of the gland are also possible.