A patient with ophthalmoplegic migraine is described, and his computed tomography and magnetic resonance imaging findings are discussed. According to our results, triad migraine, third nerve palsy, and focal enhancement of an enlarged third cranial nerve at the root exit zone should be considered pathognomonic of the disease, and further examinations should be avoided. Pathogenetic theories of the disease are discussed, and we suggest a new pathogenetic theory.
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