Yоu аre dispаtched tо а mоtor vehicle crash on a rural road where a single vehicle is up on an embankment. The vehicle has front-end damage and a starred windshield. The unrestrained driver is lying supine in the road; the police report that they found the patient outside of the vehicle. He is unconscious and has obvious facial bleeding. Examination reveals a hematoma and depression of the lefttemporal area, both eyes are black and blue, and one pupil is dilated, whereas the other is normal. The patient has blood coming from the nose and mouth, and palpation reveals subcutaneous emphysema around the clavicles and chest area. The patient's breathing is labored, and the pulse is rapid and thready.The unequal pupils most likely indicate what type of injury?