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A 7-year-old boy presented with fever and ataxia 20 days after oral polio vaccination. Magnetic resonance imaging showed extensive myelitis, involving both anterior and posterior horns of the gray matter. Complete posttreatment recovery was evident. Postvaccinal myelitis after oral polio vaccination, of either infectious or immune mediated etiology, is very rare entity that should be promptly recognized in order to initiate adequate treatment.