B2N2 I have to side with daveintake here. A number of us have been somewhat reserved that this poster's history may be a problem but advised him to seek formal clarification. I suspect your knowledge of what the FAA will say is no better. Why not let him ask for a definitive decision? In fact your suggestion that he could be a big liability is wrong. Medically the chance of a problem is quite small - I suspect he has a drivers license for example - it is just that the level of risk allowed is SO low that he may not make it. And although I surmise you didnt mean it, suggesting that his AVM was a 'stupid little accident' was insensitive
Daveintake - you sometimes get some rough answers her, but please take the advice to ask an AME. Nothing ventured, nothing gained.