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Normal cranial nerves in the cavernous sinuses: contrast-enhanced three-dimensional constructive interference in the
Akiko Yagi1, Noriko Sato, Ayako Taketomi
1Department of Diagnostic Radiology and Nuclear Medicine, Gunma University School of Medicine, Showa-machi, Maebashi Gunma, Japan.
AJNR. American Journal of Neuroradiology
|April 9, 2005
Summary
Contrast-enhanced 3D CISS MR imaging clearly visualizes cranial nerves (CNs) in the cavernous sinus. This advanced technique offers superior detection rates compared to T1-weighted imaging, aiding in diagnosing cavernous sinus diseases.
Area of Science:
- Radiology
- Neuroimaging
- Magnetic Resonance Imaging
Background:
- Three-dimensional (3D) constructive interference in steady state (CISS) MR imaging is valuable for visualizing cranial nerves (CNs) within the cistern.
- The cavernous sinus is a critical anatomical region housing several important CNs.
Purpose of the Study:
- To evaluate the effectiveness of contrast-enhanced, 3D CISS MR imaging in visualizing normal cranial nerves (CNs) III, IV, V1, V2, and VI within the cavernous sinuses.
- To compare the diagnostic performance of contrast-enhanced 3D CISS MR imaging with contrast-enhanced T1-weighted MR imaging for CN detection.
Main Methods:
- Contrast-enhanced 3D CISS MR imaging was performed on 76 normal cavernous sinuses from 38 patients to assess CN III-VI detectability.
- A subset of 40 cavernous sinuses from 20 patients underwent comparison between contrast-enhanced 3D CISS and contrast-enhanced T1-weighted MR imaging.
Main Results:
- Contrast-enhanced 3D CISS MR imaging successfully demonstrated individual CNs, with all CNs identified in 29% of patients.
- Detection rates for intracavernous segments were high: CN III (100%), CN IV (61%), CN V1 (92%), CN V2 (88%), and CN VI (96%).
- 3D CISS imaging showed significantly higher detection rates than T1-weighted imaging for CNs IV, V1, V2, and VI (P < .05).
Conclusions:
- Contrast-enhanced 3D CISS MR imaging provides excellent visualization of cranial nerves within the cavernous sinus.
- This imaging modality is a valuable tool for diagnosing cavernous sinus pathologies, including Tolosa-Hunt syndrome.
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