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MR detection of secondary changes remote from ischemia: preliminary observations after occlusion of the middle
M Nakane1, A Tamura, T Nagaoka
1Department of Neurosurgery, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
Purpose:
To determine whether secondary MR changes occur in the thalamus or the substantia nigra after middle cerebral artery (MCA) occlusion in rats.
Methods:
Sprague-Dawley rats were subjected to MCA occlusion. At varying intervals, proton density-, T1-, and T2-weighted images were obtained with a 4.7-T superconductive MR unit.
Results:
T2-weighted images revealed an area of high signal intensity in the ipsilateral substantia nigra 4 days after occlusion. A lesion of low signal intensity appeared in the ipsilateral thalamus 7 days after surgery on proton density- and/or T2-weighted images.
Conclusion:
MR showed secondary changes in the thalamus and the substantia nigra after MCA occlusion in rats. MR imaging should provide more information on the neuropathology of the delayed neuronal degeneration after cerebral ischemia.
Insights
Magnetic resonance (MR) imaging revealed secondary changes in the thalamus and substantia nigra following middle cerebral artery (MCA) occlusion in rats. This study highlights MR
Area of Science:
- Neuroscience
- Radiology
- Ischemic Stroke Research
Background:
- Middle cerebral artery (MCA) occlusion is a common cause of ischemic stroke.
- Understanding secondary brain changes is crucial for developing effective treatments.
Purpose of the Study:
- To investigate secondary magnetic resonance (MR) imaging changes in the thalamus and substantia nigra after MCA occlusion in a rat model.
- To assess the utility of MR imaging in detecting delayed neuronal degeneration.
Main Methods:
- Middle cerebral artery occlusion was performed on Sprague-Dawley rats.
- Proton density-, T1-, and T2-weighted MR images were acquired using a 4.7-T superconductive MR unit at various time points post-occlusion.
Main Results:
- T2-weighted MR images showed high signal intensity in the ipsilateral substantia nigra by day 4 post-occlusion.
- A low signal intensity lesion was observed in the ipsilateral thalamus by day 7 post-surgery on proton density- and/or T2-weighted images.
Conclusions:
- MR imaging successfully demonstrated secondary neuropathological changes in the thalamus and substantia nigra following MCA occlusion in rats.
- MR imaging offers valuable insights into the delayed neuronal degeneration processes after cerebral ischemia.