Central Sarcomata. 379 



— Section of the lower end of an injected left femur and 

 adjacent part of tibia, soft parts partially dissected — in spirit, 

 illustrating the above. 



A large tumour growing from the lower end of the femur 

 has almost entirely replaced it. The tumour is composed of 

 lobuks of soft substance, separated by firmer and more vascular 

 tissue, and^breaking down in the centre. The tumour has invaded 

 the knee-joint, and has grown through the femur all round, 

 especially behind. The bone is eroded but not expanded, and 

 is not apparently infiltrated. A distinct capsule has been formed 

 by the soft parts round the tumour. Described formerly as a 

 "cancer of the lower end of the femur." G. C. 2446. 



Presented hy Bell Pettigkew, F.R.C.S.E. 



6. 438. Central Sarcoma of the Humerus.— Right humerus, 

 muscles dissected off — in spirit, illustrating the above. 



A firm mass is seen continuous with the bone, and entirely 

 replacing it between the upper third and the condyles. 

 Various sections have been made, and a hole has been cut 

 through the interior. The soft parts round the tumour have 

 been pushed aside and an appearance of a capsule has been 

 formed. G. C. 1054. 



Presented hy Professor James Russell. 



6. 439. Sarcomatous Tumour of a Rib.— Portions of two ribs 



of the left side — in spirit, illustrating the above. 



The interior of the lower of the two ribs is entirely re- 

 placed by a tumour. The substance of the tumour is some- 

 what spongy and spicular, and seems to have been breaking 

 down. The upper of the two ribs is partly absorbed by the 

 pressure of the tumour, which seems fairly well encapsuled on 

 the outer and inner aspects. 



" The section of a tumour formed on a rib, supposed by 



