CHAPTER XXIII. 



SIMPLE TUMOURS. 



FIBROMA OE FIBROUS TUMOUR — PAPILLOMA — LIPOMA — NEUROMA 



ENCHONDROMA — CRUSTA-PETROSA TUMOURS — PSAMMOMA — OSSE- 

 OUS TUMOURS OSTEOMA PARASITIC CYSTS CYSTIC TUMOURS — 



TEETH TUMOURS SARCOMATA —MELANOSIS — ACTINO-MYCOSIS — 



CARCINOMATA HARD CANCER — SOFT CANCER — EPITHELIAL 



CANCER. 



I. — SIMPLE OR HISTIOID TUMOUKS. 



The most common forms of tumour met with in veterinary 

 practice are fibrous tissue tumours — Fibromata, and ordinary- 

 warts — Papilloma, fatty tumours — Lipoma, and cartilage 

 tumours — Encliondroma. 



The fibroma, a fibrous tumour usually found in parts which 

 contain much fibrous tissue, is slow in its growth, and is not 

 accompanied by pain or tenderness, unless accidentally inflamed ; 

 is of a hard, rounded form, with its surface smooth or divided 

 into lobes; generally moveable, and contained in a wall of 

 areolar tissue. 



The most familiar example is the subcutaneous wart. These 

 are of various sizes; some as small as a pea, others as large 

 as a goose's egg, lodged in the subcutaneous areolar tissue, 

 singly or in clusters. They differ much in their degree of con- 

 nection with surrounding parts, being sometimes firmly attached 

 by continuity of tissue, at other times loosely imbedded in 

 them, and easily moveable beneath the skin. Although many 

 groups of several tumours in each may exist in the same 

 structure or organ, it is very rare to see them co-existent in 

 separate organs. They have very few vessels ; indeed, some 

 seem to have no blood-vessels, and no immediate communi- 

 cation with the surrounding parts, but are lodged in a sac, 

 and derive their nourishment by imbibing nutrient fluid from 

 its walls. 



