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 



