Bone affected hy Ncighhouring Congestion. 229 



There is great periosteal development on the surface of 

 lioth hones, especially at their lower ends. On the outer side 

 of the lower end of the fibula the surface is porous, and has 

 ■evidently formed part of the floor of an extensive ulcer. This 

 ■surface presents a striking contrast to that of the other portions 

 •of both bones. At other places the character of the outgrowths 

 .and the condition of the surface is similar to that seen in Nos. 

 ■6. 61 and 6. 63. It should be noted that at the lower end of 

 the fibula, besides the thickening of the bone and the porous 

 character of the surface, there are at one or two places distinct 

 .dej)ressions or erosions. It would appear, therefore, that the 

 ulcer as it progressed and deepened had first induced the bony 

 outgrowth, then opened out its surface, and finally had begun 



.to attack it. F. P. C. 433. 



Presented ly Professor JoHX Thomson. 



6. 68. Bony Outg-rowths on the Tibia and Fibula, associ- 

 ated with Chronic Ulcer of the Leg.— Lower two- 

 thirds of a left tibia and fibula — macerated, to show the above. 

 The bones are anchylosed at their lower ends, and the 

 changes are chiefly in the fibula. This bone, especially near its 

 lower end, is greatly thickened, and its surface is covered by 

 irregular foliacious masses. The tibia shows, about five inches 

 from its lower end, a very marked node, with a portion pro- 

 jecting shelf-like towards the fibula. The surface of this node, 

 as well as the surfaces of some of the irregular projections 

 on the fibula at a lower level, are porous, and probably formed 

 the base of an extensive ulcer. The rest of the tibia is com- 

 paratively free from bony outgrowth, except at the upper part 

 ■of the outer surface, where irregular deposits are present. 



B. C. I. 6. M. 24. 



6. 69. Bony Outgrowths on the Tibia, associated with 

 Chronic Ulcer of the Leg. — Portion of a tibia — macerated, 

 to show the above. 



