Respected Sir, hi evaluated MRI report thoroughly. Sir sorry to tell but we have to evaluate the reports in concern with the symptoms patient suffering and his / her clinical condition for which we give judgements of necessary treatments needed. but in absence of that what I can provide you I am trying my best.*Till size of aneurysm 2mm and 3-4 mm is not of that great clinical significance if patient is not having that extent of symptoms or discomfort, but if patient have severe symptomatology it matters a lot.* treatment options : if no major / discomforting symptoms no intervention at all required. if needed best stereotactic options available ranging from coiling and other procedures with expert neurosurgeons.* outcome without surgery it may remain as it is for long time also without disturbing , but for progress you have to keep in regular follow up with neurosurgeon and regular evaluation in terms of progress in size of the lesion . Outcome after surgery is best told by operating neurosurgeon. Hope this clears your doubts to some extent. thanks , regards, would love to help in future.Bye takecare