posterior fossa tumors

midline
- medulloblastoma (hyperdense, enhances)
- astrocytoma (hypodense, enhances)
4th ventricle
- ependymoma (most common, slow-growing, expands ventricle)
- medulloblastoma (usually obliterates ventricular cavity)
- choroid plexus papilloma (more common in lateral ventricles)

Charles E. Kahn, Jr., MD - 2 February 1995
Last updated: 1 October 2013