INFLAMMATION OF THE LUNGS 59 



arthritis, gangrenous pododermatitis, phlegmon of the hind 

 limbs, etc. It may also result from navel infection (thrombo- 

 phlebitis) of which it is a common sequela or it may originate 

 from inflammation of the jugular or saphenous veins. It 

 is a frequent sequela of acute gastro-intestinal disorders in 

 calves. 



Necropsy. — Metastatic or embolic pneumonia is charac- 

 terized by multiple abscess or necrotic centres which occur 

 throughout the lung tissue. At the same time there are 

 symptoms of septicemia and pyemia. 



Symptoms. — The symptoms of metastatic pneumonia are 

 often quite vague, as the embolic centre cannot always 

 be determined by percussion and auscultation. Where a 

 primary abscess exists, and the patient suddenly shows 

 septic fever, dyspnea and cough a metastatic pneumonia 

 should be thought of. In the later stages symptoms of 

 abscess of the lung (purulent nasal discharge, etc.) are 

 significant. 



Treatment. — Treatment is unavailing. 



Interstitial Pneumonia. — Definition. — Interstitial pneumo- 

 nia is an inflammation of the connective tissue of the lung 

 which proliferates, causing induration or sclerosis. 



Etiology. — It is a secondary disease and may follow any 

 form of pneumonia, especially the catarrhal. It most 

 frequently occurs in the course of chronic pulmonary tuber- 

 culosis, glanders, contagious pleuropneumonia of cattle, 

 verminous pneumonia or any form of inflammation of the 

 lungs which is chronic. 



Symptoms. — The symptoms depend upon the extent of the 

 connective-tissue proliferation and the amount of infection. 

 Briefly, they consist in dyspnea, dulness on percussion, 

 absence of the vesicular murmur and the gradual emaciation 

 of the patient. There is usually no increase in temperature. 



Diagnosis. — The diagnosis of chronic interstitial pneu- 

 monia is extremely difficult unless it follow an acute attack 

 of croupous or catarrhal pneumonia or pleuritis. In cattle 

 if due to tuberculosis it may be diagnosed by the tuberculin 

 test and in the horse the presence of glanders may be deteT- 

 mined by the various tests for this disease. 



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