An 18-year-old male is
admitted with a history of progressive drowsiness. The previous day he had
been seen in the accident and emergency department where he had presented with
a history of a head injury after being involved in a brawl in a nightclub.
As he had been well with no
neurological signs, he had been discharged with instructions to take
paracetamol if he developed a headache.
On examination he was
drowsy but there were no localising signs.
What is the likely cause of
this patientís decreased level of consciousness?