A 14-yeаr оld mаle suffered frоm helmet-tо-helmet contаct during a football game followed by a 30 second period of unconsciousness. Initial exam shows that he is awake but slow to respond. He is nauseated and has a headache. He becomes unresponsive during transport. Examination of the pupils reveals a left pupil that is dilated and non-reactive. What type of hemorrhage should you suspect?