Doctors diagnose hemifacial spasm through physical examination, medical history, and imaging tests such as MRI or CT scans and angiography. Magnetic resonance imaging or MRI creates a detailed image with powerful magnets and radio waves. Sometimes doctors inject a contrast dye into a blood vessel to highlight abnormal blood vessels that could be irritating facial nerves. A magnetic resonance angiogram is an MRI scan that uses this dye.

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