Lesions 



673 



existing capillaries. Avascularity may be a factor in the necrosis 

 of the larger tuberculous masses, though probably playing no 

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

 purely toxic. 



Fig. 278. 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. 



The minute primitive tubercle was first called a miliary tubercle, 



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



As almost all tissues contain a supporting connective-tissue 



43 



