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Ovoid mass measuring 77 x 75 x 50mm (FH x RL x AP) located at posterior cranial fossa with moderate mass effect on the brainstem, left temporal lobe. There is 6mm of contralateral midline shift and 10mm tonsillar herniation. The mass demonstrates heterogeneous T1 and T2 signal intensities, but more valuable is high DWI signal reflecting diffusion restriction, with corresponding low ADC values.