Intraventricular mass lesions of the brain: CT and MR findings.

One tenth of all CNS neoplasms involve the ventricles of the brain. These mass lesions are located in areas that are difficult to reach surgically, and because they are intraventricular, spread via the CSF is common. CT and MR imaging have been useful in demonstrating these masses, but imaging characteristics are usually nonspecific. The location of the mass and the patient's age provide the most helpful information in the differential diagnosis.