TUBERCULOSIS IN THE HORSE. 465 



After its return to hospital some of the tumours had disappeared, 

 a few completely ; but others had grown and continued to enlarge. 



The animal appeared incurable, and was slaughtered a few days 

 later. 



Autopsy. — The lesions found on post-mortem examination were more 

 generalised than had at first been supposed. On dissecting away the 

 skin numerous small tumours, scattered through the subcutaneous 

 tissue, were seen at some points discrete, at others more closely 

 placed. A certain number were continuous with the corium. The 

 smallest of these tumours was the size of a pea, the largest the size of 

 the yolk of an egg. The majority were rounded, firm, and of fibrous 

 consistence. 



Here and there traces of the above-mentioned lymphangitis could 

 be noted. The lymphatic glands at the entrance of the chest were 

 enlarged, and formed two lobes, each the size of a walnut. 



Graver lesions, which had not been suspected during life, existed in 

 the muscles and viscera. 



A large number of the muscles showed bands of sclerotic tissue 

 and little rice-like whitish nodules. These growths were very abundant 

 in the levator anguli scapulae, the rhomboideus, the extensors of the 

 neck, the small oblique muscles of the abdomen, but especially in the 

 adductors of the two hind limbs, and in the superficial glutei, these two 

 last muscular groups being crowded with them. 



On opening the abdominal cavity certain viscera, particularly the 

 liver and spleen, were seen to be invaded by these tumours. The liver 

 and spleen were crowded with fine granulations ; the spleen, in addi- 

 tion, contained three tumours the size of a walnut. The peritoneum 

 covering the stomach showed a collection of granulations resembling 

 recent tuberculous growths. Of the various abdominal lymphatic 

 glands the sublumbar alone were affected. They formed an ovoid 

 mass, the size of a man's fist, which had not been detected on rectal 

 exploration. 



The other abdominal viscera, together with the lung, heart, pleura, 

 nervous centres, and bones, were free of these growths. 



Histological examination extended to the muscles, skin, liver, and 

 spleen. The diseased muscles showed the same characters as in tuber- 

 culous cirrhosis of muscle. In the skin, liver, and spleen the tubercles 

 contained a large number of giant-cells. They tended, especially those 

 in the spleen, towards fibrous change, and were exceedingly poor in 

 tubercle bacilli. 



164. A seven-3-ear-old entire horse, brought to the school on the 

 8th May, i8g6, for castration. 



History. — The horse had been bought in 1894. At that time the 

 scrotum was large, but the seller declared the condition to be con- 

 genital. The animal worked well until February, 1896, when the 

 scrotum became swollen and appeared to interfere with movement ; the 

 patient fell away in condition. Castration was decided on. 



Condition on Entry. — At first glance this horse appeared in good 

 health. The right testicle was much larger than the left. Its en- 



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