Thyroid Gland Lobe

**Semantic type:** Anatomical Structure

**Definition:** Either one of the two lateral lobes of the thyroid gland, or the additional pyramidal lobe that is found superior to the isthmus between the lateral lobes in approximately one-third of cases as a normal variant. The pyramidal lobe is a remnant of the thyroglossal duct that is also called Lalouette's pyramid.