Bell's palsy other diagnostic studies

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Other Diagnostic Studies

• Electrodiagnostic studies help determine the prognosis, and imaging studies can define potential surgical causes of facial palsy.
• These tests are not necessary in all patients.
• Patients with a typical lesion that is incomplete and recovers do not need further study.
• Electrodiagnostic studies (EMG, or motor nerve conduction study) and Imaging (CT, or MRI) are needed if the physical signs are atypical, there is slow progression beyond three weeks, or if there is no improvement at six months.
• There is no test that provides prognostic information early enough to be used for guiding treatment or prognosis.