53. A 30 year old woman fell down four stairs landing on concrete.witnesses report she was unconscious for five minutes beginning immediately after the fall. She regained full consciousness during the ten minute transport to the hospital. Upon arrival in the emergency department, she is awake, alert, and responsive with a GCS score of 15. Her only complain is a slight headache. Thirty minutes later, she becomes unresponsive with a GCS score of 6. On the exam, her left pupil is large and nonreactive. The right pupil is normal. The one type of neurological injury most consistent with this patient's entire clinical course since her fall : A subdural hematoma An epidural hematoma An occipital lobe hemorrhage Focal subarachnoid hemorrhage A cerebellar hemorrhage a b C d e