[A Case of Sjögren's Syndrome Associated with Thyroid Cancer]

A 42-year-old woman who had a history of Sjögren's syndrome was admitted to our hospital because of a mass lesion in the left cervical region. A hard tumor in the left lobe and a smaller mass in the central area was detected by ultrasonography and computed tomography. Subtotal thyroidectomy with lymph node dissection was performed. The central mass was minimal thyroid carcinoma. The minimal thyroid carcinoma was discovered accidentally during therapy for Sjögren's syndrome. Because the symptoms decreased, surgery of the thyroid carcinoma could be performed. When it was aggravated, it was thought to be diagnosed carefully.