294 Diseases of Bone. 



6. 240. Syphilitic Disease of the Skull.— Skull-cap of an 



elderly person — macerated, illustrating the above. 



The changes are best seen at and behind the vertex. The 

 bone is unchanged below the temporal ridges, but elsewhere it 

 is more or less porous. At the back and to the left side of the 

 sagittal suture there are numerous irregular apertures, due 

 apparently to enlargement of vascular channels. At places 

 near the vertex areas of bone are mapped out by pores and 

 erosions^ and the surface of the upper part of the occipital bone is 

 similarly roughened. The interior of the skull-cap, especially 

 near places most affected on the outside, shows marks of con- 

 siderable vascularity, but there is practically no bone formation. 

 There are two small bony projections near the front, one on 

 either side of the longitudinal sinus — apparently, by their 

 smoothness, of long standing. The skull-cap is apparently not 

 thickened, but is increased in weight from condensation of the 

 diploe. B. C. i. 7. M. 9. 



6. 241. Syphilitic Disease of the Skull.— Portion of left 



parietal bone — macerated, illustrating the above. 



There is great roughness on the outside, and sclerosis and 

 thickening of the substance. The roughness on the outside is 

 due to erosion, and the opening out and running together of 

 vascular channels. The interior shows somewhat similar 

 changes, only less marked. On the lower portion of the sawn 

 surface the superficial openings are seen to penetrate well into 

 the bone, and at some places to pass quite through it, while the 

 bone on the section at the upper side is almost uniformly white 

 and dense, like ivory. W. C. G. 41. 



6. 242. Syphilitic Disease of the Skull.— Skull of an adult 



(probably a woman) — macerated, illustrating the above. 



Changes are present on the frontal, parietal, occipital, superior 



