Polio-like paralysis refers to a paralytic state which is similar in clinical appearance to polio, but from which poliovirus is not isolated. Like polio, the main presenting symptoms is acute flaccid paralysis.
There are many causes, some of which are infective, e.g. coxsackie A9 and A23, and the coxsackie B viruses.
Enterovirus 71 is now considered a leading cause of polio-like paralysis in children.
MRI reveals involvement of the ipsilateral anterior horn cells (T2 hyperintensity with accompanying enhancement). If there is radioculomyelitis, there may be thickening and enhancement of the ventral nerve roots of the cauda equina 3.
- T2: hyperintense anterior horn cell
- T1+C (Gd): enhancement of the ventral nerve roots and anterior horn cell
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