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Atypical and Malignant Meningiomas (AM, MM)

Last Updated: October 1, 2018

Figure 1: This atypical meningioma demonstrates some characteristics of lower grade meningioma including calcification on CT (top row left), but on bone algorithm CT (top row right), permeative bony infiltration can be seen. This is a finding suggestive of a higher grader tumor. Most lower grade meningiomas tend to exhibit underlying hyperostosis. Axial FLAIR (bottom row left) demonstrates vasogenic edema associated with the medial left parietal mass, presumably due to irritative parenchymal invasion or venous stasis, given the invasion of this atypical meningioma into the superior sagittal sinus on sagittal T1WI postcontrast image (bottom row right).

 

Figure 2: Thought more difficult to see on the T1 axial images, this left parieto-occipital convexity malignant meningioma demonstra...