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Twelve patients with clinical indications of intracranial neurovascular compression(6,hemifacial spasm;4,trigeminal neuralgia;2,vertigo and tinnitus)were studied by MRI.Axial 1 mm thick slices were obtained in a 1. 5 T unit using a three-dimensional(3D)fast low angle shot data set of 32 contiguous slices.The data were postprocessed with multiplanar reconstruction algorithms to obtain oblique sagittal(along the long axis of a nerve)images or coronal images with a slice thickness of 0.8 mm.The MR angiographic images were also obtained from the same 3D data set with maximum intensity projection algorithms.The MR studies showed that 9 of 12 patients had neurovascular compression caused by one or two arteries.These findings were verified at surgery.In two of the remaining three patient, MRI failed to delineate the affected nerves compressed by a vein in one, and a previously applied prosthesis in the other.In the last patient no neurovascular compression was found by MRI or at surgery. |
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cranial nerves
cranial nerves,vascular compression
cranial neuropathy
hemifacial spasm
MRI
MRI,abnormal
MRI,angiography
MRI,cranial nerves
MRI,false negative
neurovascular compression
trigeminal neuralgia
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