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A 66-year-old male patient with diabetes and hypertension presented with a history of 2 months of continuous fever and weight loss. He was investigated earlier and treated for upper respiratory infection, typhus, and other infections with no reduction in his fever. He had high eosinophilia and was investigated for malignancy and rheumatological diseases. Positron emission tomography-computed tomography scan revealed an increased uptake in the thyroid, and the thyroid profile clinched the diagnosis.