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A subependymoma is a type of brain tumor; specifically, it is a rare form of ependymal tumor. They are usually in middle aged people. Earlier, they were called subependymal astrocytomas.The prognosis for a subependymoma is better than for most ependymal tumors, and it is considered a grade I tumor in the World Health Organization (WHO) classification.

They are classically found within the fourth ventricle, typically have a well demarcated interface to normal tissue and do not usually extend into ...