Riedel thyroiditis demonstrated on gallium scintigraphy.

A 37-year-old woman presented with a history of gradual onset of fatigue, myalgia, low grade fever, and neck pain. A CT scan and magnetic resonance imaging were performed, which demonstrated a markedly enlarged thyroid gland with partial compression of the trachea. A gallium scan was performed to assess for gallium avid lymphoma. This demonstrated diffuse gallium uptake throughout the thyroid gland. Core biopsy showed a hyalinized fibrous stroma, chronic inflammatory infiltrate, and absence of follicular cells confirming Riedel thyroiditis. The patient's symptoms responded to corticosteroid administration and thyroxine replacement.