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The MRI confirms the intraventricular location of the cystic lesion which appears of inhomogeneous low signal on T1WI, high signal on T2WI, heterogeneous signal on FLAIR and high signal on DWI (restricted diffusion) with an ADC similar to the adjacent cerebellar parenchyma. A significant mass effect is noted on the adjacent structures (cerebellar hemispheres, tonsils, pons, and medulla) with triventricular hydrocephalus. No periventricular interstitial edema was seen.