Initially, the thyroid is enlarged and there may be transient hyperthyroidism, followed by a euthyroid state and then hypothyroidism with eventual atrophy years later.

• 最初甲状腺肿大，并出现短暂的甲状腺功能亢进,随后甲状腺功能正常，数年后甲状腺萎缩，出现甲状腺功能减退。