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Hyperostosis Frontalis Interna
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Hyperostosis Frontalis Interna
Synonyms
Morgagni-Stewart-Morel syndrome; Metabolic craniopathy; Endostosis crani; Enostosis cranii; Endocraniosis; Hyperostosis calvaria interna; HCI; Hyperostosis calvariae diffusa; HCD; HFI
Definition and Characteristics
Hyperostosis frontalis interna (HFI) is a condition involving progressive symmetric irregular cortical thickening (Fig. 1) of inner table of the frontal bone of human skull by smooth, rounded exostosis covered by dura projecting into the cranial cavity.
| Hyperostosis Frontalis Interna. Figure 1 A woman with HFI having depression in the midline of frontal bone. |
These exostoses are generally less than 1 cm thick and extend to parietal bones, orbital roofs and may involve both tables of the skull by sparing areas occupied by superior sagittal sinus and venous channels. Even in severe cases, HFI does not cross suture lines and there would be clear boundary along the