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Hemifacial spasm: three-dimensional MR images in the evaluation of neurovascular compression
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Purpose:
To assess the diagnostic accuracy of three-dimensional (3D) magnetic resonance (MR) images in the preoperative evaluation of hemifacial spasm.
Materials And Methods:
In 27 patients with surgically confirmed hemifacial spasm, the axial source images from 3D time-of-flight MR angiography were evaluated for 27 symptomatic sides and 26 asymptomatic sides by three observers in a blinded manner for neurovascular compression and identification of compressive vessels.
Results:
Sensitivity was 95% and specificity was 77%. Vascular compression on the symptomatic sides could be identified retrospectively in all 27 patients. On the asymptomatic sides, vascular compression could be excluded retrospectively in all but one patient. In the blinded study, as the mean value of three observers, the vertebral artery and posterior inferior cerebellar artery could be identified correctly in seven and 7.7 of seven and nine patients, respectively, whereas the compressive anterior inferior cerebellar artery was identified correctly in 7.7 of 16 patients.
Conclusion:
Three-dimensional MR images have a high diagnostic accuracy and are useful in the preoperative evaluation of hemifacial spasm.
Insights
Three-dimensional (3D) magnetic resonance (MR) imaging accurately detects neurovascular compression in patients with hemifacial spasm. This technique is valuable for preoperative evaluation, aiding in surgical planning and improving diagnostic confidence.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Hemifacial spasm is a neurological disorder characterized by involuntary contractions of facial muscles.
- Neurovascular compression of the facial nerve is a common cause of hemifacial spasm.
- Accurate preoperative identification of the compressive vessel is crucial for successful surgical intervention.
Purpose of the Study:
- To evaluate the diagnostic accuracy of three-dimensional (3D) magnetic resonance (MR) imaging in identifying neurovascular compression in hemifacial spasm.
- To assess the utility of 3D MR angiography in preoperative planning for hemifacial spasm surgery.
Main Methods:
- A blinded study involving three observers evaluating 3D time-of-flight MR angiography source images from 27 patients with surgically confirmed hemifacial spasm.
- Assessment focused on identifying neurovascular compression and specific compressive vessels on both symptomatic and asymptomatic sides.
Main Results:
- The study demonstrated high sensitivity (95%) and specificity (77%) for 3D MR imaging in detecting vascular compression.
- Vascular compression was correctly identified on symptomatic sides in all patients and excluded on asymptomatic sides in all but one.
- Specific arteries, including the vertebral artery, posterior inferior cerebellar artery, and anterior inferior cerebellar artery, were identified with varying degrees of accuracy.
Conclusions:
- Three-dimensional MR imaging exhibits high diagnostic accuracy for preoperative evaluation of hemifacial spasm.
- 3D MR angiography is a useful tool for identifying neurovascular compression, aiding in surgical planning for hemifacial spasm.