Over an average of 8.5 years of follow-up, 343 of these men and women were diagnosed with glioma; another 245 were diagnosed with another, usually benign type of brain tumor called meningioma.

Here is another benign meningioma beneath the dura. These neoplasms are slow growing, but may reach a large size before symptoms lead to detection.

Conclusion: malignant meningiomas do have characteristic MRI features of malignant meningioma should but be differentiated from benign ones.