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Figure 1: Pre-operative MRI showing a space occupying lesion in midline posterior fossa nearly filling the fourth ventricle. The lesion is hypointense to surrounding gray matter on plain T1-weighted image (a); shows homogeneous, intense post-contrast enhancement (b); is relatively hypointense on T2-weighted image (c); and, has moderately restricted diffusion (d) suggestive of a medulloblastoma

Figure 1: Pre-operative MRI showing a space occupying lesion in midline posterior fossa nearly filling the fourth ventricle. The lesion is hypointense to surrounding gray matter on plain T1-weighted image (a); shows homogeneous, intense post-contrast enhancement (b); is relatively hypointense on T2-weighted image (c); and, has moderately restricted diffusion (d) suggestive of a medulloblastoma