A 50-year-old male patient was brought to the ER department by ambulance 35 minutes after being struck by a truck while walking on the sidewalk. His wife reports that he was unconscious for approximately 5 minutes and has vomited three times. He is oriented to person but not to time and place. O/E shows an area of soft-tissue swelling over the left temporal region. The left pupil is fixed and dilated. A CT scan of the head is shown. Identify the diagnosis: