its cerebral AVM. here is a synopsis of pattersons options, according to procedure.
all information was gathered from wikipedia under the listing cerebral arteriovenous malformation
(Surgery VIA removing a piece of the skull) While surgery can result in an immediate, complete removal of the AVM, risks exist depending on the size and the location of the malformation. Grade 3 AVMs may or may not be amenable to surgery. Grade 4 and 5 AVMs are not usually surgically treated. (grade = size)
(on using gamma knife) While this treatment does not require an incision and craniotomy (with their own inherent risks), three or more years years may pass before the complete effects are known, during which time patients are at risk of bleeding
(radiosurgery) Radiosurgery is itself not without risk. In one large study, nine percent of patients had transient neurological symptoms, including headache, after radiosurgery for AVM. However, most symptoms resolved, and the long-term rate of neurological symptoms was 3.8%
just wanted to compile this for everyone here. Its a shame that a stand out guy on the team and the community had this happen to him. Just remember he is already a very lucky man a 4 minute seizure is nothing to gaff at. If anyone has experienced a stroke first hand they know that even a minute is an eternity, especially for the brain which is not recieving oxygen. (updated from stoke to seizure)
UPDATE: @LesBowen Dr. Nirav Saha, a neurosurgeon who happened to attend #Eagles practice today, says Mike Patterson very well might not need any surgery.