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Gd-DTPA enhanced MRI in Ramsay Hunt syndrome.

Ten patients with Ramsay Hunt syndrome underwent magnetic resonance (MR) scans. In many examinations, abnormal enhancement of the 7th nerve in the internal acoustic meatal segment through the mastoid segment was observed. Out of seven patients with cochlear and/or vestibular symptoms, only one showed abnormal enhancement of the 8th nerve, in addition to the 7th. The other 6 patients showed the same findings as in Bell's palsy, showing no enhancement of the 8th nerve. This suggests that clinical symptoms have no relation to the results of MRI. Enhanced MRI is the most sensitive means of making differential diagnoses between Hunt's syndrome and tumors, but it is impossible to detect all lesion sites corresponding to the symptoms in Hunt's syndrome.