I think with the hemangioma it would depend on the size, did it say the size anywhere on your results? I'd probably get a second opinion just for the sake of having one as the 'hyperintense lesion' would worry me more than it being a hemangioma. I'd ask for them to confirm what it is and how big it is, and then go from there.

Your pain could be from a number of things, including sciatica.