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Oligoastrocytoma is a brain tumor that forms when two types of cells in the brain, called oligodendrocytes and astrocytes, rapidly increase in number to form a mass.  These brain cells are known as glial cells, which normally protect and support nerve cells in the brain.  Because an oligoastrocytoma is made up of a combination of two cell types, it is known as a mixed glioma.[1]  Oligoastrocytomas usually occur in a part of the brain called the cerebrum and are diagnosed in adults between the ages of 30 and 50.[2]  The exact cause of this condition is unknown.[3][2]
Last updated: 10/5/2012


  1. Oligoastrocytoma. National Cancer Institute. Accessed 10/4/2012.
  2. American Brain Tumor Association. Oligoastrocytoma. Understanding Brain Tumors. 2012; Accessed 10/4/2012.
  3. Oligodendroglioma and Oligoastrocytoma. American Brain Tumor Association. Accessed 10/4/2012.
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