THE RESPIRATORY SYSTEM 79 



LARYNX 



Laryngitis 



Inflammatory disturbances of the larynx are relatively 

 common in swine but are not of sufficient gravity to 

 warrant a lengthy discussion. 



Etiology. Undue exposure and inhalation of sus- 

 pended or gaseous irritants are common causes of laryn- 

 gitis. In swine, as in other animals, laryngitis is rarely 

 a distinct process but is a condition associated with 

 inflammatory disturbances of the pharynx, or trachea, 

 and therefore the inflammatory process of the larynx is 

 frequently an extension from an adjacent structure. 

 Chronic laryngitis results from the same causative factors 

 as the acute type, being merely extended over a longer 

 period. 



Lesions. Laryngitis in swine is generally of a 

 catarrhal type and may be either acute or chronic, al- 

 though an occasional case of croupous laryngitis occurs. 

 The lesions observed are practically identical with the 

 usual lesions of this type of inflammation. 



Symptoms. The principal symptom of laryngitis is 

 a cough, which is at first dry, later moist, and always 

 painful. The cough may become convulsive. In the 

 intense acute attacks there will be rise of temperature 

 and probably inappetence. By palpation the laryngeal 

 region will be found supersensitive. 



Treatment. Provide sanitary surroundings and if 

 the patient is inclined to eat, give sparingly of easily 

 digested slops. Medicinal treatment is so difficult to 

 apply that frequently more harm than good is the result. 



Tumors 



Laryngeal tumors are rare. However, pedunculated 

 fibromas have been observed, and epithelioma has been 

 reported. 



