29th April 2024

A 30-year-old man is brought to the emergency department following a road traffic accident.

A 30-year-old man is brought to the emergency department following a road traffic accident. He was initially alert and talking but has become increasingly drowsy over the past two hours. On examination, he is confused, with a Glasgow Coma Scale score of 13. He has a headache and is vomiting. A pupil examination reveals a dilated right pupil. A CT scan of the head shows a biconvex hyperdense area adjacent to the right temporal bone.

Which is the most likely diagnosis?