It causes repeated episodes of sudden, extreme, electric-shock–like pain on the side of the face ... by a neurologist. Brain imaging, like magnetic resonance imaging (MRI), is often used ...

Hemifacial spasm (HFS) is a neurological disorder manifested by twitching on one side of the face due to involuntary contractions ... there is evidence of compression of the nerve by an abnormal brain ...

The procedure uses focused beams of ultrasonic energy guided by MRI to target areas deep in the ... This small lesion created by focusing ultrasound in a specific brain region interrupts the ...