Brain tumors are either malignant or benign,depending on the cell type.Primary tumors generally do not resemble the carcinomas and sarcomas found elsewhere in the body and rarely metastasize outside the CNS.Select the tumor that has been identified as an extremely rare and very malignant neoplasm.

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Choriocarcinoma is an extremely rare,very malignant neoplasm.Multiple factors are suspected of playing a role in the pathogenesis of intracranial neoplasms.Early diagnosis simplifies surgical treatment,because increased ICP and severe neurologic changes are not usually present.Meningiomas are usually benign,circumscribed,slow-growing tumors.A teratoma is a congenital tumor containing embryonic elements.It occurs most frequently in children and is likely to arise in or near the ventricular walls.The 5-year survival rate is 73%.Germinoma is a neoplasm arising from germ cells.Survival with germinomas is much better than with nongerminomatous tumors (teratoma,embryonal cell carcinoma,choriocarcinoma).

Brain Tumors Are Either Malignant or Benign,depending on the Cell