That seems to have checked out in you. The
MRI is used to identify a variety
of other abnormalities (some
of which you can be born with). Depending on what type of MRI they did, it can also be a stress test. The MRI is often much better than an echo, so if it's a cardiac MRI you received, that should give them better pictures than an ECHO.
It seems like they have done all the right tests.