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This is not something you want to see on an MRI. The patient was a 3 y.o. boy with a suspected upper respiratory tract infection. But why has most of his face disappeared from the scan?
Luckily the radiologist realised immediately what was going on and terminated the procedure. The shadow on the image suggested a ferromagnetic foreign body somewhere in nasal or oral cavities - which in the powerful magnetic field of an MRI scanner might have done serious damage.
The child had been given a general anaesthetic for the MRI - which was fortunate, because he had resisted all attempts to examine him at close quarters while conscious. Now the ENT physicians found and easily removed a small button cell from his nasal cavity.
Interestingly, a second MRI showed that there was still some ionic material left behind in the mucosa - the shaded areas corresponding to the right nasal cavity. The symptoms quickly resolved with antibiotics and the child made a good recovery.
Button cells and small children don't mix - keep well apart! The full case report can be read here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4252995/
