392 



Tumors. 



tory and exudative type of product. These peculiarities as well 

 as the clinical course of such cases, suggestive of their origin as 

 direct sequences of chronic inflammatory processes, force the 

 conclusion that injuries capable of causing inflammation may 

 either directly or indirectly (disturbance of tissue tension) give 

 origin to adenoma production. Mucous membrane and glandu- 

 lar vegetations of this type are usually spoken of as glandular 

 Iiypcrf>lasias or mucous membrane polyps. It should be recog- 

 nized, however, that such superficially situated adenomata may 

 become inflamed secondarily, from their coming in contact with 

 irritants. 



The most frequent type of adenomata occurring in animals 

 are those of the sebaceous and sweat glands {adenoma seba- 

 ceum, sudoriparuni) in the skin of the dog; among them particu- 

 larly growths originating from the perianal glands, presenting 

 rounded, nodular and lobulated forms, of a reddish yellow or light 

 yellow color and giving oft* a fatty, greasy fluid (a number of 

 descriptions of Siedamgrotzky, Lienaux. Werner). True ade- 

 nomata of the liver are also comparatively common in cattle and 

 sheep (Bollinger. [Martin. Siedamgrotzky. Johne. personal obser- 

 vations) as sharply defined tumors, surrounded by a connective 

 tissue capsule, situated in the midst of the hepatic tissue. These 

 may sometimes be found as large as a human head, composed 

 of liver cells and delicate cob-web like connective tissue septa. 

 They are usually very striking because of their bile-stained yel- 

 low to green hue. Similar to these there also occur in the liver 

 gall-duct tumors, with dense fibrous stroma, having, in conse- 

 quence, a firm consistency and appearing as light yellow nodular 

 deposits ranging in size from that of a potato to that of a human 

 head. The mammary gland in dogs is another frequent site for 

 cystadenomata and combined adenofibromata or for transitional 

 forms becoming cancerous. In the lungs adenomata of nodular 

 form may originate from the bronchial mucous glands, obs-erved 

 in sheep (A. Eber) and horse. 



Although in man mucous membrane polyps occur quite fre- 

 quently in the nose, such growths are more uncommon in animals ; 

 in the horse they are met hanging into the naso-pharynx, hyper- 

 plasias perhaps as large as a fist, lobulated, elongated, slippery and 

 of mucoid consistence, composed of soft mucous membrane tissue. 

 There is difficulty in trying to accurately define thyroid adenomata. 

 The colloid secreting epithelium of this organ in its proliferation 

 sometimes gives rise to a general enlargement of the gland, the con- 



