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)

© 2002, C.E. Kahn, Jr.
2002-04-18