[Predictive value of MRI for detecting and characterizing vascular compression in cranial nerve hyperactivity syndromes (trigeminal and facial nerves)].
MRI detects vascular compression of the cranial nerve in the majority of the cases. High-resolution 3D-T1 and 3D-T2 MRI gives detailed images, particularly the 3D-T2 MRI sequences, with good contrast between cerebrospinal fluid and vascular and nerve structures. TOF-AMR (native sequence and vertebrobasilar reconstruction) shows the vascular structures in hypersignal and therefore differentiates the vessels from the cranial nerves. The 3D-T1 sequence with gadolinium reinforces the signal of the venous structures. Thus, preoperative MRI makes it possible to predict the existence of a vascular compression. The correlation study between imaging data and intraoperaitive anatomical findings showed a sensitivity of MRI of 97% and a specificity of 100%. In addition, it can specify the type and the degree of the compression. This information may help in selecting the most appropriate surgical method.
Leal
P R L
PR
Service de neurochirurgie A, hôpital neurologique Pierre-Wertheimer, groupement hospitalier-Est, 69003 Lyon, France.
Froment
J-C
JC
Sindou
M
M
D003287:Contrast Media; D003389:Cranial Nerve Diseases / Q000134:cerebrospinal fluid / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D005155:Facial Nerve Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D005682:Gadolinium; D006801:Humans; D008279:Magnetic Resonance Imaging; D016343:Monitoring, Intraoperative; D009408:Nerve Compression Syndromes / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D019635:Neurosurgical Procedures / Q000379:methods; D011237:Predictive Value of Tests; D020433:Trigeminal Nerve Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery
D003287:Contrast Media; D005682:Gadolinium