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Posterior fossa mass containing cystic foci either originating from the fourth ventricles or invading it secondarily, responsible for obstructive hydrocephalus with transependymal resorption. ADC (not shown) demonstrates only moderate restricted diffusion.
The differential diagnosis for this lesion includes medulloblastoma and pilocytic astrocytoma. A rarer tumor, atypical teratoid rhabdoid tumor (AT/RT) can also have this appearance, as could an ependymoma, although there is obvious intraparenchymal extension into the right cerebellar peduncle.