This link has some interesting info. on MRI's. It talks about
a new study, revealing possible risks involved when using contrast agents including "potential brain abnormalities". It sounds like an enhanced MRI is a better idea if it seems necessary to get one.
articles.mercola.com/sites/articles/archive/2014/01/09/gadolinium-mri-contrast-agent.aspx?e_cid=20140109Z1_DNL_art_2&utm_source=dnl&utm_medium=email&utm_content=art2&utm_campaign=20140109Z1&et_cid=DM37329&et_rid=393671021