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Collaborative Hypertext of Radiology

Musculoskeletal system



hyperostosis frontalis interna

overgrowth of bone at the inner table of the frontal bone

  • usually bilateral and symmetrical
  • chiefly in females > 35 y.o.
  • no clinical siginificance
  • unknown etiology

  • irregular cortical thickening of the frontal area
  • spares areas occupied by superior sagital sinus and venous channels
  • may be 1 cm or thicker
  • occasionaly extends to parietal bones and orbital roofs

  • hyperostosis calvariae diffusa:
    • variant of HFI: more diffuse thickening of vault (involving both tables)

see: increased skull thickness

Yong H. Hahn, MD  -  2 February 1995
Last updated:  1 October 2013


Related CHORUS documents:
increased skull thickness
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diffuse osteosclerosis (dense bone)


Copyright © 2013, Charles E. Kahn, Jr.