PMC6159131_01
MRI scan of Case 1 demonstrating an extra-axial well-circumscribed mass within the left posterior fossa with a dural base against the left occipital bone. Diffusion-weighted image (DWI) (a) and associated apparent diffusion coefficientimage (b) demonstrate no restriction in diffusion. Fluid attenuation inversion recovery (c) and a T2 weighted image (d) shows associated increased signal consistent with peritumoral oedema and subsequent mass effect and effacement of the fourth ventricle. Contrast enhanced T1 image (e) shows a marginally enhancing lesion with dural tail.
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f1
Diffusion-weighted imaging (DWI) demonstrated no restriction in diffusion and therefore was suggestive of necrosis (Figure 1).
PMC6159131_02
MRI and CT image of Case 2 demonstrating a left extra-axial parafalcine mass compressing the pre- and postcentral gyri and abutting the paracentral lobule. The CT image (a) shows heavy calcification and associated oedema. Peritumoral oedema is further demonstrated on the fluid attenuation inversion recovery image (c) with no diffusion restriction (b). The contrast-enhanced T1 weighted image (d) shows a marginally enhancing parafalcine mass with associated dural tail.
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She subsequently underwent a CT scan of the brain that demonstrated a dural-based lobulated, heavily calcified left parafalcine mass associated with extensive oedema consistent with a meningioma (Figure 2).