Axial T2WI's show heterogeneous hyperintense posterior fossa mass that lies
within and expands the fourth ventricle. This mass extends anteriorly through the
left foramen of Luschka and produces significant mass effect on the brain stem and
cerebellum. Punctate hypointensities within the lesion suggest hypervascularity.
Left: axial T2WI again shows the heterogeneous nature of the posterior fossa mass.
Right: This mass is slightly hypointense on the T1WI.
Axial, sagittal and coronal T1WI's with gadolinium show heterogeneous
enhancement of this primarily intraventricular mass.
Key words: mri tumor neoplasia pathology