Autonomously functioning nodule arising from accessory mediastinal thyroid tissue
A 30-year-old female patient was investigated for radiating neck pain. Magnetic resonance imaging (MRI) revealed a right paratracheal mass in the mediastinum []. Computed tomography (CT) guided fine needle aspiration cytology (FNAC) from the mass reported it as thyroid adenoma. Clinically, the thyroid gland was not enlarged and serum thyroid hormone levels were within normal limits. Tc99m pertechnetate scan revealed high activity in the mass and poor visualization of thyroid gland in the neck []. Autonomously functioning thyroid adenoma arising from an accessory mediastinal focus with suppression of normal gland in the neck was suspected. Surgical excision of the mass was performed and histologically found to be thyroid tissue with goitrous changes. Tc99m Pertechnetate scan performed 6 weeks after surgery showed restoration of normal activity in the native thyroid gland in the neck with disappearance of the ectopic activity [].