Migration of surgical sponge retained at mediastinoscopy into the trachea.

It is uncommon to find an iatrogenic foreign body after thoracic surgery. We present a case of migration of a surgical sponge left inadvertently in the mediastinum during a troublesome mediastinoscopy, that migrated into the trachea 6 years later with airway obstruction. The foreign body was extracted through rigid bronchoscopy and the patient had a full recovery.