Unilateral Graves' Disease

<p><span style="font-weight: 400;">A 45-year-old male physician presented to the emergency department with complaints of dyspnea and chest pain. Initial evaluation demonstrated sinus tachycardia on electrocardiogram, with negative cardiac enzyme levels. Further history revealed increased bowel movements over the preceding month and an unintentional weight loss of approximately 5 kilograms within two months, in the absence of other B symptoms.</span></p> <p><span style="font-weight: 400;">Thyroid function testing showed a markedly suppressed thyroid-stimulating hormone (TSH) level of 0.0009 mIU/L and an elevated free thyroxine (free T4) concentration of 12 ng/dL. Thyroid scintigraphy revealed unilateral radiotracer uptake. The presence of anti-TSH receptor antibodies confirmed the diagnosis of unilateral Graves&rsquo; disease.</span></p>