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Hyperostosis frontalis interna

(Science: radiology) overgrowth of bone at the inner table of the frontal bone, usually bilateral and symmetrical, chiefly in females greater than 35 y.o., no clinical siginificance, unknown aetiology, 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