94 SWINE DISEASES 



Tumors 



Various tumors have been encountered in the lungs 

 of swine, but principally in autopsies or at abattoirs. 

 Lung tumors of swine are similar to the same type of 

 tumors of other tissues. Pulmonary neoplasms produce 

 no typical symptoms by which they may be recognized 

 clinically. 



Parasites 



The principal pulmonary parasite is the Metastrongy- 

 lus Apri, which has been described under bronchial 

 disorders. 



Echinococcosis pulmonum is a common disease of 

 swine. This condition is caused by the larval form of 

 Taenia echinococcus. The cysts of pulmonary echinococ- 

 cus are the same as those occurring in the liver. 



Distomiasis, or invasion of the lung with flukes or 

 Distoma, occurs but is not common in swine. 



Pulmonary stephanurosis has also been observed, but 

 is rare. 



Parasitic nodules, the supposed result of invasion of 

 some unknown parasite, are occasionally noted by 

 veterinary inspectors, but there is little significance in 

 such invasion as the lung is not edible, according to the 

 meat-inspection regulations in the United States. 



PLEURA 



Disease conditions of the pleura of swine are rarely 

 recognized clinically, though some cases of pleuro- 

 pneumonia may be determined by a clinical examination. 

 Pathologic conditions of the pleura are occasionally 

 observed by veterinary inspectors in the carcasses of 

 swine that are slaughtered. 



Hydrothorax 



Hydrothorax is a condition resulting from the accumu- 

 lation in the thoracic cavity of excessive quantities of 

 serous fluid. It is of rather rare occurrence in swine. 



