TUMOUR, INFLAMMATORY NEW GROWTH, ETC. 67 



The varieties which are malig"nant are carcinoma, sar- 

 coma, and some species of adenoma. 



Amongst the benigri are some adenomas, angioma, chon- 

 droma, fibroma, glioma, hpoma, melanoma, myxoma, myoma, 

 osteoma, odontoma, psammoma, and papilloma. 



The use of the terms sing-le and multiple depends solely 

 upon whether one or more happens to be present. 



Malig-nant Tumours. 



Carcinoma. — This variety of tumour, commonly spoken 

 of as cancer, is one of the most dangerous and rapidly 

 malignant of any which the surgeon is called upon to treat. 

 Its most common situations are the glands of the throat 

 and larynx, the mammary gland, and the orbit, although it 

 is by no means exclusively met with in these regions (see 

 pp. 121 and 133). It is almost exclusively confined to adult 

 or old age, and grows in connection with the epithelial 

 tissues, speedily infecting the neighbouring lymphatic glands. 



In an article on the subject of the occurrence of cancer in the 

 domesticated animals, ^ Piofessor MacFadyean reported that he had been 

 able to diagnose microscopically eighteen cases of true carcinoma from 

 specimens taken from the dog and cat, and amongst these one was from 

 the mammary gland, four were from the throat or neck, and five were 

 fmm the anus. 



The author, in a communication made before the members of the 

 Laryngological Society," and in a paper read before the members of the 

 Central Veterinary Medical Society in 1905, demonstrated the histories 

 of a number of cases from the dog and cat, fixe of which had come under 

 his personal observation within six months. Four of these occurred in 

 the larynx and pharynx, two in the orbit, and one in the oesophagus. The 

 ages of the patients averaged about eight years. In every case the 

 diagnosis was microscopically confirmed either by Professor MacFadyean 

 or by Drs. Bashford and Murray, of the Imperial Cancer Research 

 Association.^ 



1 



Journal of Compaiative Pathology and Therapeutics, vol. xii., p. 137. 

 - Proceedings of the Laryngological Society, November 4, 1904 ; 

 Veterinary Journal, January, 1905. 

 3 Veterinary Record, \o\. xvii. p. 694. 



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