Increased osseous thickening of the inner surface of the frontal bone.

Abstract

Increased thickening of the internal surface of the frontal bone (ISFB) was investigated, regarding possible pressure application to the brain tissue and the changes in bone marrow structure. Morphological analysis of the ISFB was carried out in a total of 300 adult skulls. Type A, defined as normal appearance, has been detected in 243 cranium. In 57 cranium (19%), increased osseous thickening cases with different appearance were observed. The most frequent examples of osseous thickening were present in nodular types (Types B, C) and diffuse types (Types D, E), (29.8%). In fact, an irregular osseous thickening, which is in the form of plaques, was situated on both sides of the origin of sagittal sulcus. Types B and C were seen as small isolated nodules on the ISFB. In the histological analysis of ISFB, it is determined that the endocranium, normally present in a compact bone structure, changed its lamellar and had a nonwoven immature bone structure, in the areas with the characteristic of increased osseous thickening. The thickening of the diploe gap and increasing lamellar bone tissue in the endocranium revealed an increase in vascularization. The nodular and widespread form of increased osseous thickening could apply pressure on to dura mater and the brain tissue.