Three-dimensional MRI of hemifacial spasm with surgical correlation |
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Authors: | N Girard M Poncet F Caces Y Tallon A Chays P Martin-Bouyer J Magnan C Raybaud |
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Institution: | Department of Radiology, H?pital Nord, Chemin des Bourrelly, F-13915 Marseille Cedex 20, France, FR Department of Otorhinolaryngology, H?pital Nord, Marseille, France, FR
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Abstract: | MRI was used to investigate 100 patients with hemifacial spasm, using 3D-FT T2-weighted (CISS) and contrast-enhanced 3D-FT
T1-weighted (turbo-FLASH) sequences in all cases. MR angiography was performed in 54 patients, using 3D-MT FISP images. Decompression
of the facial nerve through a retromastoid craniotomy was performed in all patients. Hemifacial spasm caused by tumours in
the cerebellopontine angle was not included. Vascular contact with the facial nerve root-exit zone or at the internal auditory
canal was present in 96 of 100 patients with hemifacial spasm. The vessel responsible was the vertebral artery (VA) in 18
cases, the posterior inferior cerebellar artery (PICA) in 23, the anterior inferior cerebellar artery (AICA) in 22, the VA
and PICA in 24, VA and AICA in 3, PICA and AICA in 1, VA, PICA and AICA in 4, and a vein in 1 case. CISS images showed compressive
vascular loops better than contrast-enhanced turbo-FLASH images alone. The sensitivity of MRI was high, since only one false-negative
case was found among the 100 patients who underwent surgery.
Received: 10 July 1995 Accepted: 4 June 1996 |
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Keywords: | Hemifacial spasm Magnetic resonance imaging Magnetic resonance angiography |
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