A 25-year old man presents in the ER with his wife. The history has to taken from the wife, because the patient is unable to communicate. He was well until 10 o’clock that morning, when he suddenly collapsed and became unconscious. On arrival in the ER, he slowly seems to regain consciousness. In the previous days, he hadn’t complained of anything and was feeling fine. On examination, the patient is semiconscious (GCS 10/15), not wasted, he has no edema and he’s not pale. He has a pulse of 68/min (regular), a blood pressure of 180/120 mm Hg and a respiratory rate of 24/min. He has oral thrush, no Kaposi’s sarcoma and there are no bruits over the carotid arteries. Examination of heart and abdomen show no abnormalities. Neurological examination reveals normal eye movements, the pupils are normal in size and responding to light. The patient can open his mouth and the corneal reflex is intact. He’s also able to hear whispering, but he has asymmetry of the face and his mouth is drooping on the left. Also, both the left arm and leg show absent reflexes and loss of power (0/5) with normal sensation, the right side is normal. He has a normal gag reflex, normal power in the sternocleidomastoid muscles and tongue protrusion is symmetrical. Questions. 1. What’s your diagnosis? 2. What investigations should be done?