Follicular Thyroid Carcinoma Metastasis to the Retromolar Trigone: A Case Report.

Follicular thyroid carcinoma (FTC) may occasionally present with metastatic disease at atypical oral sites. This report describes a case of FTC involving the retromolar trigone. A 48-year-old woman with a history of FTC treated a decade earlier with total thyroidectomy and radioactive iodine therapy presented with a two-month history of a mass in the left retromolar region. Histopathological analysis of an incisional biopsy confirmed a metastatic well-differentiated follicular thyroid carcinoma. A conservative surgical approach involving left-sided modified radical neck dissection, followed by radioactive iodine management, caused complete resolution of the patient's retromolar lesion. Follow-up over six months showed no evidence of recurrence. This case highlights a rare presentation of FTC metastasizing to the retromolar trigone. It underscores the importance of maintaining a high index of suspicion for metastatic disease in unusual oral lesions in patients with a history of thyroid cancer.