Brain tumors are either malignant or benign,depending on the cell type.Both primary and metastatic tumors of the brain and its membranes are included in the term intracranial tumors.Which two tumor types are the most frequently seen central nervous system (CNS)tumors in adults?

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Brain metastases outnumber primary neoplasms by at least 10 to 1 and are the most common brain tumor in adults.The exact incidence is unknown,but it has been estimated that 100,000 to 170,000 new cases are diagnosed in the United States each year.Glioblastomas represent 17% of all primary brain tumors,and account for about 54% of all gliomas.It is one of the few tumors that is capable of invading both cerebral hemispheres by crossing the midline.

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