Meningioma - with abundant edema
Headache and altered personality.
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At the anteromedial aspect of the left anterior cranial fossa is an extra-axial vividly enhancing mass associated with marked vasogenic edema with resultant subfalcine herniation. A CSF cleft is visible around the mass.
The patient went on to have a craniotomy and excision of the mass which confirmed the diagnosis of a meningioma. Some meningiomas result in significant edema in the adjacent brain. This is only sometimes due to direct invasion.