A 45-year-old woman suddenly became comatose several days after a renal transplantation. On examination, her systolic blood pressure had reached 260 mm Hg and her pulse was 28 beats per min. She had a left-sided, wide, light-fixed pupil. She localised to a pain stimulus but required intubation for airway protection. CT scan of head showed a large acute subdural haematoma, with shift of the midline structures and crowding …