Meningioma with brain invasion
Headaches increasing over past few months.
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Large extra-axial mass arising form the olfactory groove in the anterior cranial fossa associated with oedema in the right frontal lobe. At some places the cortex is not visible, despite a good CSF cleft seen surrounding the majority of the mass.
The patient went on to have a resection which confirmed the diagnosis of WHO grade II meningioma (brain invasion).
Although invasive meningiomas more frequently have oedema, oedema per se is not a good predictor of invasiveness.