accessory thyroid tissue

accessory thyroid tissue

an isolated mass of tissue that arises from the developing thyroid gland and appears in the tongue or thymus gland.

ac·ces·so·ry thy·roid tis·sue

(ak-sesŏr-ē thīroyd tishū)
Isolated mass of tissue that arises from the developing thyroid gland and appears in the tongue or the thymus gland.