Thyroid hemiagenesis is a form of thyroid dysgenesis characterized by an absence of half of the thyroid gland that is usually asymptomatic but may result in primary congenital hypothyroidism, a permanent thyroid deficiency that is present from birth.
Thyroid hemiagenesis is a form of thyroid dysgenesis characterized by an absence of half of the thyroid gland that is usually asymptomatic but may result in primary congenital hypothyroidism, a permanent thyroid deficiency that is present from birth.
Content last reviewed: 2026-06