intra- vs. extra-axial brain mass

                                                  Intra         Extra
                                                  -----         -----

      contiguity with bone or dura                  -             +

      CSF cisterns                               effaced       widened

      bony changes                                rare          often

      cortico-medullary buckling                    -             +

      vascular supply                            internal      external

Charles E. Kahn, Jr., MD - 2 February 1995
Last updated: 1 September 2006