Back in '81, the neurologist insisted I have an MRI every single year for the rest of my life.
[and yeah, I skipped 5 or 6 of them because frankly, they're boring and nothing ever changed]
The last was about 2 years ago and the "empty" fluid-filled space is now *mostly* scar tissue.
Same hole, different stuffing, I reckon.
They always say everything looks okay and I'll probably skip this year's as well.
[unless I can finagle a PET scan outta them, instead]...;)
oh, an MRI can be other than boring.
Imagine you have lost your sense of balance, have an hellacious headache, are constantly nauseated, appear to be having thermal regulation problems... and as a consequence get slapped into a hospital.
Due to a comedy of errors (and it IS funny... NOW) you get diagnosed with terminal/inoperable brain tumor and slapped into the cancer "exit lounge".
Then you get an MRI.
You still have that headache, mind you, so that damned GNG!GNG!GNG!GNG!GNG!GNG!GNG!GNG! the machine makes is really horrible.
This goes on for 70 minutes.
THEN, the techs exclaim "THAT can't be right!" accuse you of having moved while being scanned, then lock your head in one of those "halo" abominations, and run it again.
oh, yes: MRIs can be ever so exciting.
btw: it yielded exactly the same results with "halo" as without.