Title: Hemifacial Spasm - an overview | ScienceDirect Topics
Headings: Hemifacial Spasm
Hemifacial Spasm
Hyperkinetic Movement Disorders
Epidemiology
Hemifacial Spasm
Definition and History
Hemifacial Spasm
CPA-IAC
Diagnostic Checklist
Skull and Brain
Key Differential Diagnosis Issues
Microvascular Decompression of the Seventh Cranial Nerve
PATIENT SELECTION
Clinical overview and phenomenology of movement disorders
Hemifacial spasm
Diseases of the Seventh Cranial Nerve
Familial Hemifacial Spasm

Content: 2003; Tan et al., 2003 ). Epidemiological studies have mainly concentrated on primary HFS, the major form. The relative proportion of primary and secondary HFS varies substantially among the clinical series. Notwithstanding such difficulties, available studies suggest that secondary HFS may also be a frequent neurological problem. Secondary HFS frequently follows peripheral facial palsy or may be more rarely secondary to facial nerve or brainstem damage after tumors, demyelinating disorders, trauma, and infections ( Table 48.1 ). Table 48.1. Causes of secondary hemifacial spasm
Postparalytic (Bell's facial palsy)
Cerebellopontine angle mass lesions
Meningioma
Schwannoma
Arteriovenous malformation
Brainstem lesions
Trauma
Demyelinating disorders
Infections
Parotid gland tumor
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URL: https://www.sciencedirect.com/science/article/pii/B9780444520142000483
Hemifacial Spasm
W.H. Jost, in Encyclopedia of Movement Disorders, 2010
Definition and History
Hemifacial spasm (HFS) is characterized by unilateral, involuntary, irregular clonic twitches or tonic (rarely) contractions of the muscles of the face innervated by cranial nerve VII.