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Within the inferior aspect of the fourth ventricle is a mass with very high T2 signal (similar to CSF) and low T1 signal (again, similar to CSF). On FLAIR the mass does not fully attenuate, and no contrast enhancement is present. Importantly on DWI / ADC the mass demonstrates restricted diffusion.
Despite its size, the mass does not result in hydrocephalus. It is an isolated abnormality.