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MR imaging of acute cortical venous infarction: preliminary experience with an animal model
R D Secrist1, V Traynelis, S S Schochet
1Department of Radiology, West Virginia University Medical Center, Morgantown 26506.
Abstract:
Surgically ligated cortical veins in rabbits produced areas of hemorrhage and infarction. Pathological correlation with serial magnetic resonance (MR) imaging of these surgically created lesions was obtained. Imaging within 4 hours after ligation showed the site of venous infarction to be a focus of low signal intensity on T1-weighted images (T1WI) within a larger overlapping area of high intensity on T2-weighted images (T2WI). The serial imaging showed persistence of T1WI and T2WI changes without alteration of pattern. At 3-day follow-up, both the T1WI and T2WI changes were maximal. At 7- and 14-day follow-up, T1WI and T2WI changes showed regression. There was no identifiable site of paramagnetic influence within the lesions produced. This lack of local paramagnetic effect may be related to the acuteness and minute size of the lesions, partial volume effects, and/or atmospheric exposure of the lesion related to the surgical procedure. Our preliminary results are encouraging not only for trying to image cortical venous infarction but also in trying to define the sensitivity of MRI for small cortical lesions.
Insights
Magnetic resonance imaging (MRI) can detect venous infarction in rabbit brains. Serial MRI showed changes in T1-weighted images (T1WI) and T2-weighted images (T2WI) that regressed over time.
Area of Science:
- Neurology
- Radiology
- Vascular Biology
Background:
- Cortical venous infarction is a challenging condition to diagnose.
- Magnetic resonance imaging (MRI) offers potential for visualizing such lesions.
Purpose of the Study:
- To correlate pathological findings with serial MRI of surgically induced cortical venous infarction in rabbits.
- To evaluate the sensitivity of MRI in detecting small cortical lesions.
Main Methods:
- Surgical ligation of cortical veins in rabbits to create lesions.
- Serial MRI including T1-weighted images (T1WI) and T2-weighted images (T2WI) at various time points post-ligation.
- Pathological examination of the lesions.
Main Results:
- Early MRI (within 4 hours) showed low signal intensity on T1WI and high intensity on T2WI at the infarction site.
- These signal changes persisted and peaked at 3 days, then regressed by 7 and 14 days.
- No paramagnetic effects were identified within the lesions.
Conclusions:
- Serial MRI can effectively image surgically induced cortical venous infarction in rabbits.
- MRI demonstrates characteristic signal changes that evolve over time.
- Further research is warranted to define MRI's sensitivity for small cortical lesions.