We report on a posttraumatic aneurysm of the brachiocephalic trunk, somethi
ng which is rather rare. The injury was caused by blunt chest trauma follow
ing a car accident. Computed tomography could not find the brachiocephalic
lesion. In patients with fractures of the upper ribs after blunt chest trau
ma, angiography should be done to exclude severe injuries of the aorta and
brachiocephalic vessels.