TUMORS IN THE LUNG 63 



glanders, contagious pleiu-opneumonia 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 pleiu-itis. In cattle 

 if due to tuberculosis it may be diagnosed by the tuberculin 

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

 mined by the various tests for this disease. 



Course and Prognosis. — ^The course is usually chronic, the 

 disease lasting for weeks or even months. The prognosis is 

 bad, for although death may not always ensue, the patient 

 is left with a chronic incurable dyspnea. 



Treatment. — ^Treatment is of no avail. Life may be 

 prolonged by treating as in catarrhal pneumonia. Edible 

 animals should be slaughtered. In horses fibrolysin (grs. xv) 

 given subcutaneously every other day is recommended. 



TUMORS IN THE LUNG. 



While ttonors in the lung are not uncommon they rarely 

 attain clinical importance as the diagnosis is so difficult 

 They sometimes produce symptoms of dyspnea, pulmonary 

 hemorrhage, flatness on percussion and emaciation. Fever 

 is not present and the course is chronic. Many of them 

 originate by metastasis. The most common tumors are 

 sarcomas, melanomas, adenomas, fibromas, and in aged 

 animals particularly carcinomas. 



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