Convexity cystic meningioma
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Large extra-axial mass with a broad dural base at the right temporoparietal region. It is homogeneous and well circumscribed. It is isointense to grey matter in T1, hyperintense in T2 and FLAIR. It exerts a mass effect in the form of compressing underlying brain parenchyma, right lateral ventricle, and midline shift to the right side and compression upon the right crus of the midbrain. It is associated with adjacent cystic lesion (trapped CSF) that shows free diffusion.
Such imaging features are typical for convexity meningioma. The cystic lesion adjacent to the tumor mass can be considered as an arachnoid cyst between the meningioma and the brain following CSF intensities along all pulse sequences and so it is considered as a type 5 cystic meningioma. Also, it belongs to intracranial non-neoplastic tumor-associated cysts.