Pathology Delqfield and Prudden, 



Plate VIII. 



Diffuse (Chronic) Pulmonary Tuberculosis " Chronic 

 Phthisis." 



In the upper half of the lung there are scattered miliary tubercles 

 and irregular areas of consolidation, with a diffuse formation of fibrous 

 tissue ; the pleura is thickened. A large portion of the lower lobe is 

 densely consolidated from tubercle tissue and exudate with coagulation 

 necrosis of the involved regions. These regions are light in color, 

 dense, hard, and bloodless. Such dead caseous areas may persist for 

 some time, or may soften and disintegrate, giving rise to cavities. 



