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Hyperdense middle cerebral arteries identified on CT as a false sign of vascular occlusion
R A Rauch1, C Bazan, E M Larsson
1Department of Radiology, University of Texas Health Science Center, San Antonio 78284-7800.
Insights
A hyperdense middle cerebral artery (MCA) on CT scans does not reliably indicate stroke. Patients with a hyperdense MCA showed higher hematocrit, hypertension, and diabetes, not necessarily vessel occlusion.
Area of Science:
- Neurology
- Radiology
- Vascular Imaging
Background:
- The middle cerebral artery (MCA) is crucial for brain perfusion.
- Identifying MCA occlusion early is vital for stroke management.
- Hyperdensity on CT can suggest blood flow issues.
Purpose of the Study:
- To assess the diagnostic value of a hyperdense MCA segment on CT.
- To explore the relationship between MCA hyperdensity and cerebral infarction.
Main Methods:
- Evaluated 13 patients with hyperdense M1 MCA segments.
- Collected data on hypertension, diabetes, and hematocrit.
- Compared findings with a control group lacking MCA hyperdensity.
Main Results:
- No unilateral hyperdense MCA correlated with ipsilateral stroke.
- Patients with hyperdense MCA had higher hematocrit, hypertension, and diabetes.
- Higher hematocrit may increase blood density; diabetes/hypertension linked to vascular calcification.
Conclusions:
- Hyperdense MCA on CT is not a definitive sign of vessel occlusion.
- It does not reliably predict subsequent cerebral infarction.
Purpose:
To evaluate the middle cerebral artery (MCA) on CT, including its relationship to cerebral infarction.
Methods:
Thirteen patients with either a unilateral or bilateral hyperdense M1 segment of the MCA were evaluated. History of hypertension, diabetes, and hematocrit were obtained and compared with a control group of patients without a hyperdense MCA.
Results:
None of the patients had a unilateral hyperdense MCA ipsilateral to a clinically identifiable stroke. Patients with a hyperdense MCA had a statistically higher hematocrit and also a higher prevalence of hypertension and diabetes mellitus than patients without a hyperdense MCA. The higher hematocrit may have increased the density of the blood, while both diabetes and hypertension are associated with calcification within blood vessel walls.
Conclusion:
A hyperdense MCA is not a reliable indicator of occlusion of this vessel or subsequent infarction.