Traumatic subarachnoid-mediastinal fistula mimicking a ruptured aorta.

A 35-year-old man, injured in an automobile accident was found to have a subarachnoid-mediastinal fistula that mimicked a ruptured aorta. Of 16 reported cases of traumatic subarachnoid-mediastinal fistula, this is only the third in which the fistulous communication was with the extrapleural space only. The possibility of subarachnoid-mediastinal fistula, although rare, should be entertained in injuries to the thoracocervical spine when neurologic symptoms are present.