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hemifacial_spasm_etiology [2019/11/26 14:08]
administrador
hemifacial_spasm_etiology [2019/11/26 14:09] (current)
administrador
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 see [[Vascular compression in hemifacial spasm]]. see [[Vascular compression in hemifacial spasm]].
 +
 +[[Hemifacial spasm]] is usually caused by arterial compression at the [[root exit zone]] of the [[facial nerve]]. However, other etiologies have been reported. ​
 +
 +Purely venous compression is rarely encountered. ​
 +El Refaee et al. reported for the very first time arachnoid bands strangulating the nerve as a cause for hemifacial spasm without involvement of any vessel
 +((El Refaee E, Marx S, Rosenstengel C, Baldauf J, Schroeder HWS. Arachnoid bands
 +and venous compression as rare causes of hemifacial spasm: analysis of etiology
 +in 353 patients. Acta Neurochir (Wien). 2019 Nov 21. doi:
 +10.1007/​s00701-019-04119-5. [Epub ahead of print] PubMed PMID: 31754846.
 +)).
  
 2. idiopathic 2. idiopathic
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 b) facial myokymia: continuous facial spasm which may be a manifestation of an intrinsic b) facial myokymia: continuous facial spasm which may be a manifestation of an intrinsic
 ---- ----
- 
- 
 Rare tumor-related HFS associated with [[meningioma]]s,​ [[epidermoid]] tumors, [[lipoma]]s,​ and [[schwannoma]]s in the [[cerebellopontine angle]] have been reported. The exact mechanism and the necessity of [[microvascular decompression]] for tumor-induced HFS is not clear, especially for [[vestibular schwannoma]]s. Rare tumor-related HFS associated with [[meningioma]]s,​ [[epidermoid]] tumors, [[lipoma]]s,​ and [[schwannoma]]s in the [[cerebellopontine angle]] have been reported. The exact mechanism and the necessity of [[microvascular decompression]] for tumor-induced HFS is not clear, especially for [[vestibular schwannoma]]s.
  
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 )). )).
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-Imaging data of 341 patients with a HFS who underwent [[microvascular decompression]] were reviewed retrospectively and compared with 360 controls. The [[hemodynamic]]s of typical anatomical variations of the [[vertebral artery]] (VA) were analyzed using [[computational fluid dynamics]] (CFD) software. 
  
-Asymmetry of the left and right VAs was prevalent, and the left VA was the most dominant VA. A dominant VA was more prevalent in the HFS group than in the control group (p=0.026). A Left HFS had a significantly higher proportion of a left dominant VA, and a right HFS had a significantly higher proportion of right dominant VA (p<​0.001). CFD models showed that angulation and tortuosity of vessels caused remarkable pressure difference between vascular walls of opposite sides. Dynamic clinical observations showed the mode of vessel transposition coincided with biomechanical characteristics. 
  
-Anatomical variations and hemodynamics of the vertebrobasilar arterial system are likely to contribute to vascular compression formation in a HFS 
-((Wang QP, Yuan Y, Xiong NX, Fu P, Huang T, Yang B, Liu J, Chu X, Zhao HY. 
-Anatomical variation and hemodynamic evolution of vertebrobasilar arterial system 
-may contribute to the development of vascular compression in hemifacial spasm. 
-World Neurosurg. 2018 Dec 26. pii: S1878-8750(18)32897-3. doi: 
-10.1016/​j.wneu.2018.12.074. [Epub ahead of print] PubMed PMID: 30593967. 
-)). 
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 Liu et al. retrospectively analyzed 10 patients with vestibular schwannomas out of 5218 cases of hemifacial spasm between 2004 and 2014. Liu et al. retrospectively analyzed 10 patients with vestibular schwannomas out of 5218 cases of hemifacial spasm between 2004 and 2014.
  
hemifacial_spasm_etiology.txt ยท Last modified: 2019/11/26 14:09 by administrador