CT is a 24-year-old female who noticed that a swelling on the anterior surface of her neck has become progressively larger. Physical examination by her doctor revealed the development of exophthalmos as well as weight loss in the patient. In response to questioning by her physician, CT indicated that she had been uncharacteristically nervous and irritable. Furthermore, she had been experiencing heart palpitations and excessive sweating. CT was referred to an endocrinologist who ordered several tests.