[Hyperthyroidism due to an ectopic intrathoracic thyroid].
We present an 84-year-old woman with hyperthyroidism caused by an ectopic intrathoracic thyroid that was removed by sternotomy. Ectopic intrathoracic thyroid, also called primary intrathoracic goitre, is a rare presentation of thyroid disease and comprises about 1% of all mediastinal masses. Its coexistence with hyperthyroidism is extremely uncommon. Its removal usually requires thoracotomy or sternotomy.