424 BOVINE PATHOLOGY. 



Exostoses and Osseous Tumours, in general, are the result 

 of ossification of an inflammatory deposit, whether in 

 connection with or separate from a bone. Osteophytes 

 are bony tumours, generally of loose texture. Exostoses 

 are treated more in detail elsewhere (see p. 399). 



Calcareous Tumours are inflammatory exudates, in which 

 earthy matter has been deposited, or, not infrequently, the 

 result of calcareous degeneration of hydatids. 



Lymphomata have been already alluded to (see p. 225). 



There are other forms of solid tumours, but they are of 

 little importance to us at present. 



Cystic Tumours are not simple hypertrophies, but 

 result from the formation of cavities filled with fluid, 

 their walls being more or less dense. They comprise : — 



Hoematomata — blood-containing cysts — generally the 

 result of injury, and sometimes having a false aneurismal 

 character. 



Serous Abscesses j due to injury, which has caused the for- 

 mation of a space by rupture of areolar fibres and condensa- 

 tion of the surrounding connective tissue to form the wall of 

 a cavity containing serum. These are most frequently seen 

 in front of the knee. They are most prevalent in bulls. 



Fig. 84. — Suction Trocar, used in exploring fluctuating tumours. The 

 blunt end of the instrument consists of a compressible india-rubber ball. 

 (From Erichsen's ' Surgery.') 



Bursal enlargements. — Dropsies of bursse may be due to 

 excessive accumulation of synovia, or to sprain of the tendon 

 belonging to the bursa, or simply the manifestation of 

 a general tendency to effusion in consequence of debility. 



Hydatids. — These are larval tapeworms, sometimes en- 

 closed in a fibrous investment formed by condensation of 

 the areolar tissue of the part in which they are situated. 



Dermopilous cysts have been described among skin 

 diseases (p. 354). 



