A case of Riedel's thyroiditis treated with tamoxifen: another successful outcome.

Objective: To report a case of Riedel's thyroiditis, which was successfully treated with tamoxifen.

Methods: We present the clinical, laboratory, and imaging findings and describe the clinical course of a patient with Riedel's thyroiditis.

Results: A 40-year-old woman presented with hypothyroidism and a large goiter, which was unresponsive to hormone replacement therapy.