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There is marked diffuse leptomeningeal enhancement most pronounced over the cerebellum and in the basal cisterns. There is also nodular enhancement in the right basal ganglia likely via the perivascular spaces.
There is a focus of restricted diffusion in the left inferomedial cerebellum compatible with a small PICA branch infarction. There is no hemorrhage.
Small polyps or retention cysts in the maxillary sinuses.