I've now had two appointments with a concussion specialist - by all accounts an outstanding doctor (former neurosurgeon). He said that MRIs typically don't reveal anything in relation to a concussion, but he said it might be worth doing one just to cover all my bases. He said I didn't need to decide one way or the other right away.

Has anyone had an MRI following a "mild" concussion? What sorts of things might it tell a competent doctor? I would prefer to avoid being stuck in that tube for half an hour if I can help it...