Case report: follicular adenoma in a thyroglossal duct remnant arising entirely within the hyoid bone.

INTRODUCTION We describe here the first reported case of a follicular adenoma arising from a thyroglossal duct remnant within the hyoid bone in Singapore. CLINICAL PICTURE A 32-year-old woman presented with an asymptomatic lump in the anterior midline of her neck of three months' duration. CT scan showed an expansile lesion localised to the medulla of the body of the hyoid. TREATMENT A well-defined intrahyoidal mass was found at surgery. Histology revealed a follicular adenoma arising from maldescended thyroid tissue within the hyoid bone. OUTCOME Recovery was uneventful. CONCLUSION It is important to consider thyroglossal duct carcinomas as a differential diagnosis when evaluating anterior neck lumps.