246 CLINICAL VETERINARY MEDICINE AND SURGERY. 



cavernous spaces (Fig. 21). In some cases only one or two large lesions 

 may exist ; in others both lobes are crammed with granules. Secondary 

 lesions may also be seen, such as those of bronchitis and peribronchitis, 

 broncho-pneumonia, bronchiectasis, emphysema, or pulmonary oedema. 



The tracheo-bronchial glands, which are almost always affected in 

 cases of pulmonary tuberculosis of any age, usually show moderate 

 enlargement, appearing as a collection of little hardened masses the 

 size of a pea, haricot bean, or almond. As in the dog, they may, 

 however, become of large size, forming an ovoid or irregular mass 

 surrounding the terminal portion of the trachea, the origin of the 

 bronchi, the large vessels at the base of the heart, and the nerves 

 traversing this region (Fig. 22) ; on section their tissue appears greyish 

 or marbled with black lines, and dotted over with whitish, hard or 

 softened caseous tubercles. They may .undergo cystic transformation : 

 the centre is then occupied by a cavity filled with greyish or slightly 

 lactescent liquid. 



In the majority of cases of pulmonary tuberculosis the visceral 

 layer of the pleura is thickened, injected, and covered with false 

 membranes opposite the seat of the pulmonary disease centres. Some- 

 times the costal and diaphragmatic portions of the pleura are covered 

 with granulations ; sometimes the mediastinum and its lymphatic 

 glands show change. Finally, one or both of the pleural sacs and the 

 pericardium may contain a varying quantity of serous or purulent 

 liquid. 



Intestinal tuberculosis is characterised by ulcerations of varying 

 extent, depth, and number, which sometimes perforate the bowel. The 

 mesenteric lymphatic glands are very commonly diseased. Opposite 

 the caecum they are usually confluent, forming yellowish bosselated 

 masses, with caseous or purulent centres. The liver often contains a 

 very large number of fine granules, isolated or massed together. Until 

 now the voluminous cystic new growths occasionally seen in the dog 

 have not been described in the cat. The spleen is simply enlarged or 

 nodular on the surface ; sections through its tissue show granulations 

 and tubercles, the largest scarcely exceeding a pea in size. In tuber- 

 culosis of the kidney the external surface of the organ and the surface 

 of sections sometimes show fine granulations, sometimes tubercles, or 

 even greyish-white tuberculous areas, with cystic or purulent centres. 

 Lesions of chronic nephritis are not uncommon. Bang claims to have 

 seen a case of primary tuberculosis of the right kidney. As tuberculosis 

 of the organs of generation is very rare I shall merely mention the case 

 of primary tuberculosis of the uterus seen by Jensen in a female cat, 

 and recorded by him as an example of infection per coitiim — tuberculosis 



