CHRONIC FIBROUS PNEUMONIA. PUI.MONARY 

 SCI.EROSIS. 



Synonyms. Interstitial Pneumonia : Cirrhosis of the lung. 

 Induration of the lung. Pulmonary Fibrosis. Pulmonary Phthisis. 



As usually seen this is rather a result of other inflammations 

 and morbid processes than a disease by itself. It consists 

 in a fibrous degeneration, extending from the bronchia, blood- 

 vessels, interlobular connective tissue or pleura and in which the 

 exudate does not pass into active degenerative processes — gran- 

 ular, purulent, liquefactive, gangrenous — but becomes built up 

 into new white fibrous tissue. It follows also on recovery after 

 destructive changes of the lung with loss of substance as after 

 abscess, or necrosis, with subsequent absorption and removal of 

 the sequestrum, in the healing of vomica, after miliary glanders, 

 and in the seat of hydatids which have died and withered up. 

 In such cases the cyst or the portion of tissue affected and re- 

 moved, with more or less surrounding and organized exudate 

 forms a cicatrix, or, if larger, a fibrous or cirrhotic mass, which 

 takes the place of the lung tissue. This is, therefore, in many 

 cases rather a beneficial and reparatory process than a destruc- 

 tive one, nevertheless its existence impairs the capacity of the 

 lung and of respiration, and renders the animal permanently 

 short-winded. It also predisposes to other lesions of the lung, 

 such as emphysema, bronchiectasis, carnification, chronic bron- 

 chitis, etc. 



SOLIPEDS. 



Causes. Chronic fibrous pneumonia may result from the 

 acute fibrinous form, from broncho-pneumonia, from contagious 

 pneumonia, from influenza, from capillary bronchitis and, above 

 all, from chronic pleurisy and hydrothorax. Morbid deposits 

 like glanders, actinomycosis, so-called botriomycosis, aspergillus, 

 and ecchinococcus may also be incriminated. A condition favor- 

 able to cirrhosis is an exudation in small amount of a strongly 

 nucleated lymph, which being near a sufficient blood supply, 

 and having ample plastic cells present, tends at once to organi- 



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