Close
There is an extra-axial mass of irregular lobulated margins centered on the 4th ventricle and extending to the cisterna magna, foramen magnum as well as to the median and lateral apertures. It displays a low signal on T1, heterogeneous/dirty signal on FLAIR, and high signal on T2WI with no enhancement on the postcontrast sequence. It shows a high signal on DWI with low ADC (restricted diffusion).
A mass effect is noted on the brainstem and cerebellar hemispheres with mild cerebellar atrophy.