Search by Outline Set Search Limits Advanced Search Back Home

Bimastoid Line on Radiographic Image


  • The bimastoid line is a line connecting the tip of the right and left mastoid bones. 
  • The distance below this line to the tip of the dens is used to assess for the presence of basilar invagination.  The distance should be less than 10 mm above this line.

Bimastoid Line

    Radiographic (X-Ray) Image

    Bimastoid Line Image

    Related Content

    To see other related content please select an item below:


    Digastric Line               Lateral X-Ray       Odontoid View

    Editors & Reviewers

    Editors:  Anthony J. Busti, MD, PharmD, FNLA, FAHA
    Last Updated:  June 2015