A medical diagnostic imaging examination that is ordered for one of the following reasons:

1) The cat scan (CT scan) came back inconclusive.
2) The Radiologist needs a new Ferarri.
3) Your doctor is an idiot.
4) You actually needed one (least likely).
I went to the doctor and the x-ray showed an abnormality, so he ordered a cat scan. The cat scan was inconclusive, so they tried an ultrasound. The ultrasound was basically useless so my doctor ordered an MRI.
by Flight23 December 20, 2006
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someone who likes to inflict pain to the rear end on another mammal, using specifically dental tools.
Watch your behind, that mri is walking behind us.
by Daddy Longer Legs December 18, 2017
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