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Magnetic resonance imaging of meningiomas
Abstract:
Twenty-eight patients with 32 meningiomas were studied on a 0.5-T superconductive magnetic resonance (MR) imager. This common, benign treatable tumor was more clearly seen on computed tomography (CT) than MRI in 53% of cases. This is a result of poor contrast between the tumor and the adjacent brain on all spin-echo and inversion-recovery pulse sequences. Those sequences that provide the greatest anatomic detail were best for identifying this low-contrast lesion. Inversion-recovery scans in particular demonstrated the tumor as a discrete hypointense mass (relative to nearby white matter) with excellent visualization of the dural base and white matter buckling indicative of extracerebral mass effect. Other characteristic features include: a hypointense rim because of the venous capsule (66%); mottling due to hypervascularity; a well defined edema collar that demarcates the tumor from adjacent brain; and hyperostosis with thickening of the calvaria and obliteration of its normal landmarks. MRI did not demonstrate tumor calcification but did demonstrate vascular encasement, displacement, and occlusion better than CT and as well as digital venous angiography.
Insights
Magnetic resonance imaging (MRI) has limitations in visualizing meningiomas due to poor contrast. Specific MRI sequences, however, can reveal key tumor features and vascular details better than computed tomography (CT).
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Meningiomas are common, benign brain tumors.
- Accurate imaging is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To evaluate the effectiveness of magnetic resonance imaging (MRI) compared to computed tomography (CT) for meningioma detection.
- To identify characteristic MRI features of meningiomas.
Main Methods:
- Study included 28 patients with 32 meningiomas.
- Utilized a 0.5-T superconductive magnetic resonance imager.
- Compared MRI findings with CT scans and digital venous angiography.
Main Results:
- Computed tomography (CT) provided clearer visualization in 53% of cases due to MRI's poor contrast.
- Inversion-recovery MRI sequences showed discrete hypointense masses with dural base and buckling.
- Characteristic MRI findings included hypointense rim, mottling, edema collar, and hyperostosis.
- MRI detected vascular encasement, displacement, and occlusion better than CT.
Conclusions:
- While CT can be superior in some cases, specific MRI sequences offer detailed anatomical information for meningiomas.
- MRI effectively visualizes tumor margins, vascular involvement, and mass effect, aiding in diagnosis and surgical planning.