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Bilobed extra-axial mass of the right posterior fossa crossing the tentorium cerebelli. The inferior, larger component of the mass is peripherally low signal on T2 with internal high T2 components. The superior component is markedly hypointense on T2 and hyperintense to grey matter on T1. The mass has facilitated diffusion and avid, heterogenous enhancement. Associated mass effect on the right cerebellar hemisphere and compression of the 4th ventricle. No hydrocephalus.