De Quervain's subacute thyroiditis presenting as a painless solitary thyroid nodule.

We describe a 39-year-old woman presenting with a painless solitary thyroid nodule, initially without signs suggesting thyroiditis. The serum level of thyrotropin was suppressed whereas those of thyroxine and triiodothyronine were normal. Fine needle aspiration cytology showed no signs of inflammation or malignancy. One week later, the patient felt pain and tenderness on her neck, and erythrocyte sedimentation rate and C-reactive protein were markedly elevated. Thyroid scintigraphy showed a suppressed thyroid pertechnetate uptake. At that time, the diagnosis of subacute thyroiditis was made. Upon treatment with steroids the patient's symptoms as well as the thyroid nodule resolved. This case illustrates that subacute thyroiditis de Quervain may present as a solitary, painless nodule with suppressed thyrotropin and should therefore be considered in the differential diagnosis of such lesions.