Large extra-axial tumour with broad-based attachment to the planum sphenoidale and extension into the left olfactory groove. This is hyperintense to grey matter on T2, isointense on T1, with abnormally increased diffusion restriction, and bright homogeneous enhancement following contrast administration. There is a small enhancing dural tail at the left sphenoid.
Extensive mass effect on both frontal lobes (left greater than right ). Almost complete effacement of the left lateral ventricle and third ventricle. Mass effect on the midbrain. 1.1 cm of midline shift to the right. Diffuse sulcal effacement in both hemispheres.
Extensive vasogenic oedema surrounding the tumour: in the left frontal lobe extending into the anterior corpus callosum and left insula.
There is entrapment of the right lateral ventricle with surrounding FLAIR hyperintensity indicating transependymal fluid shift.
The A2 and A3 segments of both anterior cerebral arteries are displaced to the right by the mass.
No intracranial aneurysm or evidence of steno-occlusive disease.