I read your question carefully and I understand your concern. I must say that your description is somewhat unclear though because it presents two different possibilities. The first of nonspecific foci is a benign finding which warrants only paying attention to vascular risk factors such as blood pressure, diabetes, cholesterol, smoking etc. The diangosis of vasculitis on the other hand is a much more serious condition, which requires treatment with corticosteroids and close monitoring. Its diagnosis often is not easy involving angiography (an invasive test where it is entered in you blood vessels with a catheter from the groin traveling up to the arteries feeding the brain and injecting contrast), at times even brain biopsy is necessary. So since they are two different diagnosis with different management, evolution and outcome it is hard to give a precise answer with the information at hand. I would suggest you consult a neurologist as soon as possible with the brain imaging and reports. I hope to have been of help.