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A large, lobulated, solid, heterogeneously enhancing, extra-axial, dura based mass noted growing both sides of the dura with obvious intracranial and extracranial extensions.
The mass is hyperintense on T1WI, isointense to gray matter on T2WI, showing no restriction of diffusion on DWI and there is no blooming artifact seen on GRE sequence. On spectroscopy there is high choline and low myoinositol peak noted.
Intracranial component is growing Inferiorly into the parietal region causing significant compression of parenchyma and lateral ventricle in the parietal lobe and moderate vasogenic edema. However the margins of this part of lesion are regular and it does not appear to invade the parenchyma.
The outer/extra-axial component shows an enhancing dural tail and shows no defined margins. This component of the lesion appear to invade the parietal bone and extending further into the subgaleal tissue in the scalp evident by abnormal thickening and enhancement of dura, calvaria and subgaleal soft tissue.
Imaging features signify a cellular non glial aggressive extra-axial mass; most likely aggressive meningioma.
Another diagnostic possibility includes a hemangiopericytoma.