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| | Hemifacial Spasm - Overview, Causes, Risk, Diagnosis - neurologychannel |
 | | Hemifacial spasm is a neuromuscular disorder characterized by frequent, involuntary muscle contractions (tics or spasms) in the face. |
 | | Hemifacial spasm may be caused by an injury to the seventh cranial, or facial, nerve; a tumor or a blood vessel pressing on the nerve; or Bell's palsy. |
 | | Most cases of hemifacial spasm are caused by a blood vessel pressing on the facial nerve, and this vessel is usually too small to be detected by magnetic resonance imaging (MRI), computed tomography (CAT scan), or angiography. |
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