THYROID HEMIAGENESIS WITH SUBACUTE THYROIDITIS

A 58-year-old woman with thyroid hemiagenesis associated with subacute thyroiditis is described. Physical examinations revealed a firm nodul e with spontaneous pain and tenderness in the left thyroid lobe. A ser um thyroid hormone levels were elevated and thyroid scintiscan with Tc -99m pertechnetate showed an extremely low uptake, we made a diagnosis of subacute thyroiditis. A Tl-201 thyroid scan demonstrated an enlarg ed left lobe and absence of the right lobe. Ultrasonography of the thy roid gland revealed an enlarged left lobe occupied mostly with a hypoe choic region. An incidental finding was absence of the right lobe. Two months later thyroid function returned to normal. A follow-up thyroid scintiscan revealed a normal left lobe but absent right lobe. The dia gnosis of hemiagenesis was confirmed by CT scan. This appears to be th e first case report of thyroid hemiagenesis associated with subacute t hyroiditis.