Central Sarcomata. 377 



The tumour, when fresh, appeared to the naked eye to be 

 a sarcoma infiltrating the muscles and tissues of the leg, with 

 large areas of degeneration and blood extravasation. Micro- 

 scopically, it was found to be a "fibro-sarcoma." 



The greater part of the interior of the tumour was so soft 

 and diffluent that it was washed out from what is now seen as 

 an empty space. The upper end of the fibula is completely 

 destroyed, but there are some plates of bone still remaining in 

 the wall of the tumour. The tumour has, therefore, evidently 

 burst through the fibula, after having partially expanded it. 

 The muscles are stretched over the tumour, and partly involved 

 in it. G. C. 3233. 



Presented by P. H. Watson, F.E.C.S.E. 



6. 432. Central Sarcoma of Fibula.— Lower end of a right 



fibula — macerated, illustrating the above. 



The bone about the middle has been transformed into a 

 hollow shell, the wall of which is in some places very thin, 

 while at others it is half an inch thick, and is composed of 

 cancellated tissue. The lining of the interior shows irregular 

 cavities. 



This specimen was formerly described as a case of " spina 

 ventosa." W. C. G. 28. 



6. 433. Central Sarcoma of Tibia.— Part of a right femur and 



bones of the leg and foot of a child— macerated, illustrating the 

 above. 



The lower half of the tibia has been destroyed by what 

 must have been a central tumour. The affected part is 

 represented merely by a membrane at the back and outer 

 side, continuous above with the shaft. The interior of 

 what remains of the cavity is smooth. The fibula in the 

 region of the tumour has been flattened out into an elongated 



