Question: An 80-year-old man is admitted with a sudden picture of aphasia and right hemiparesis. As background highlights, hypertension, well controlled diet and cognitive impairment in the last year under study by his neurologist. Emergency cranial CT demonstrates a left frontal lobar hematoma without contrast enhancement. What is the most likely cause of the hematoma? 
 Options:  <1> Arteriovenous malformation masked by the acute hematoma. <2> Chronic arterial hypertension. <3> Vasculitis isolated from the nervous system. <4> Brain tumor. <5> Amyloid cerebral angiopathy (congophilic angiopathy).
5