Rokkit got to it before I did lol. Yes, without any contrast dye and a heart monitor to dampen the signals, a regular MRI won't show much. Heck our brains are full of blood vessels hither and yon and can't see those either on a regular MRI. I know I looked at my thoracic MRI from last year to see if there was anything to see back then and nothing. Mark.
RRMS Dx'd 2007, first episode 2004. Bilateral stent placement, 3 on left, 1 stent on right, at Stanford August 2009. Watch my operation video: http://www.youtube.com/watch?v=cwc6QlLVtko
, Virtually symptom free since, no relap