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Juvenile pilocytic astrocytoma. The juvenile pilocytic astrocytoma pictured in these magnetic resonance images appears as a mainly cystic neoplasm centered in the cerebellar vermis. There is a dominant cyst and smaller mural solid component, as seen on T1 precontrast images (A), with small areas of nodular enhancement within the mural component, as seen on T1 postcontrast images (B). The tumor fills and obstructs the fourth ventricle, causing noncommunicating hydrocephalus.
