The thyroid gland is commonly included in the radiation field during treatment of nonthyroidal neoplastic disease of the head and neck. As a result, thyroid abnormalities sometimes occur following external irradiation. We report an unusual case of radiotherapy-associated Graves ophthalmopathy 5 months after adjuvant external irradiation of the head and neck in a euthyroid patient who had undergone wide local excision of squamous cell carcinoma from the floor of the mouth.
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