7i6 



Tuberculosis 



portant part in the degeneration of the small tubercles, which is 

 purely toxic. 



The minute primitive tubercle was first called a miliary tubercle, 

 and small aggregations of these, "crude tubercles," by Laennec. 



Fig. 285. — Tuberculosis of the lung: the upper lobe shows advanced cheesy 

 consolidation with cavity-formation, bronchiectasis, and fibroid changes; 

 the lower lobe retains its spongy texture, but is occupied by numerous miliary 

 tubercles. 



As almost all tissues contain a supporting connective-tissue frame- 

 work whose fibers are more resistant to necrosis than the cells, after 

 the cells of a tubercle have been destroyed, fibers may still be visible 

 among the granules, and give the tubercle a reticukted appearance. 



