Meningioma MRI
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Meningioma Microchapters |
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Diagnosis |
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Meningioma MRI On the Web |
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American Roentgen Ray Society Images of Meningioma MRI |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Haytham Allaham, M.D. [2]
Overview
Brain MRI with gadolinium is the investigation of choice for the diagnosis of meningioma. On brain MRI, meningioma is characterized by a homogeneous, well circumscribed, and extra-axial mass with a broad dural base. Other Findings on brain MRI suggestive of meningioma include CSF vascular cleft sign, dural tail sign, and sunburst or spokewheel appearance of the vessels.
MRI
- Brain MRI with gadolinium is the investigation of choice for the diagnosis of meningioma.
- On braim MRI, meningioma is characterized by a homogeneous, well circumscribed, and extra-axial mass with a broad dural base.
- Other Findings on brain MRI suggestive of meningioma include:
- Dural tail sign
- CSF vascular cleft sign
- Sunburst or spokewheel appearance of the vessels
- When the appearance and location of meningioma are typical, the diagnosis can be made with a very high degree of specificity.
- In the case of anaplastic meningioma, the degree of edema correlates with the invasion of the surrounding tissue by the tumor.
- Signal characteristics include:
- T1 weighted image illustrates:
- Isointense mass in 60-90% of the cases
- Hypointense mass in 10-40% of cases
- T1 C+ weighted image (image enhanced with gadolinium) usually illustrates an intense and homogeneous enhancement
- T2 weighted image illustrates:
- Isointense mass in 50% of the cases
- Hyperintense mass in 35-40% of the cases
- Hypointense mass in 10-15% of the cases