.140 



TUBERCULOSIS 



In secondary or 

 generalized tuber- 

 culosis one or more 

 of the organs, 

 omentum, serous 

 membranes, or lym- 

 phatic S}stem may 

 become more or less 

 thickly sprinkled 

 with minute grey- 

 ish nodules about 

 the size of a millet 

 seed. These tuber- 

 cles are at first al- 

 most the color of 

 mother-of-pearl but 

 later as the central 

 caseous degenera- 

 tion begins they be- 

 come g r a 3' i s h . 

 Giant cells are usu- 

 ally numerous. 



In studying the 

 lesions in a fatal 

 case of tuberculosis 



Fig. 27. Dorsal aspect of bovine lungs show, 

 ing posilion of the posterior mediastinal glands, 

 a, b, c, c'., caudal, ventral, cephalic lobes, f. 

 oesophagus, g. muscular pillars of diaphragm- 

 h. posterior aorta. A. left bronchial gland, 

 i. caudal margin of the ligameiit of the lung ^ 

 Mediastinal glands are shown, viost of them 

 resting on the oesophagus. The large caudal 

 one may find with gland resting on the pillars of the diaphragm is 

 varvino" modifica- most frequently diseased and often attains an 

 tions one orSmore of ^>'ormous size. The remaining mediastinal 



the following condi- 

 tions, viz. 



(i) The primary lesion may be found in any one of the 

 organs or membranes. Its comparative age is determined by 

 the character of the anatomical changes. It may be entirely 

 encysted, caseous or calcareous and dead. In addition to this 

 primarj' focus, there may be a succession of tubercles of various 

 ages distributed in one or more organs. 



(2 ) The lesions may be restricted to one organ, as the 

 liver in which the primary focus has spread hy continuity due 



glands are arranged in two sets on the right and 

 left margins of the oesophagus. {Smith. ) 



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