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A T2W intermediate signal intensity mass in the fourth ventricle, with extension from Luschka and Magendie foramina into the right cerebellopontine (CP) angle and cervicomedullary junction, respectively.
On postcontrast images there is heterogenous enhancement within the lesion.
Obstruction of the quadrigeminal cistern and mild mass effect on the posterior midbrain represents upward extension of the mass.