Ependymoma

Ependymomas constitute between 3% and 9% of all primary brain tumors. They are the 3rd most common primary CNS tumor in children (after Pilocytic Astrocytoma and Medulloblastoma). They account for between 6% and 12% of primary CNS tumors in children. The most commonly involved sites are posterior fossa in children and spinal cord in adults. Classic ependymoma is a cellular neoplasm with sheet-like growth pattern. The tumor cells are frequently arranged around blood vessels creating perivascular pseudorosettes, many of which can be seen in this image.