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MR imaging of middle cerebral artery occlusion without cerebral infarction
Abstract:
Magnetic resonance (MR) images of 12 patients with angiographically proven middle cerebral artery (MCA) occlusion were analyzed, retrospectively. In three of the 12 patients, cerebral infarctions related to the MCA occlusions were not evident. Two of the three patients were cases of atherosclerotic occlusion and the remaining patient had an acute thromboembolism. In all of the occluded M1 portions of the MCA the flow void was absent and there were isointense linear structures, with or without a hyperintense component in the Sylvian vallecula, on T1-weighted images. For nine of the 12 patients, the absence of flow void in the ipsilateral Sylvian fissure was evident on the T2-weighted images. Therefore, even in cases with no evidence of a cerebral infarction, the presence of flow void in the Sylvian vallecula and Sylvian fissure must be searched for in routine reviews of MR images. If MR imaging can be obtained on an emergency basis, appropriate interventional therapy may be immediately initiated.
Insights
Magnetic resonance imaging (MRI) can detect middle cerebral artery (MCA) occlusion even without visible cerebral infarction. Searching for absent flow void in the Sylvian vallecula and fissure on MRI is crucial for early diagnosis.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Middle cerebral artery (MCA) occlusion is a significant cause of ischemic stroke.
- Early detection of MCA occlusion is critical for timely intervention and improved patient outcomes.
- Magnetic resonance (MR) imaging is a key diagnostic tool in cerebrovascular disease.
Observation:
- Retrospective analysis of MR images from 12 patients with angiographically proven MCA occlusion was performed.
- Cerebral infarctions were not evident in 3 of the 12 patients.
- Specific MR imaging findings, including absence of flow void and presence of isointense linear structures in the Sylvian vallecula on T1-weighted images, were noted in occluded MCA segments.
Findings:
- Absence of flow void in the M1 portion of the MCA was consistently observed in all patients with occlusion.
- Absence of flow void in the ipsilateral Sylvian fissure was evident on T2-weighted images in 9 out of 12 patients.
- These findings suggest that MR imaging can identify MCA occlusion even in the absence of apparent cerebral infarction.
Implications:
- Routine review of MR images should include a specific search for absent flow void in the Sylvian vallecula and fissure to detect MCA occlusion.
- Prompt identification of MCA occlusion via emergency MR imaging can facilitate immediate initiation of appropriate interventional therapy.
- This approach may improve treatment timelines and potentially reduce long-term disability from stroke.