PRINCIPLES OF VETERINARY SURGERY 



511 



DIAGNOSIS.— (a) Actinomycosis of the Maxilla.— Gen- 

 erally speaking, the diagnosis may be said to be easy. It 

 is sufficient to have seen a case or a photograph of the dis- 

 ease to recognize it. There are few lesions of the maxilla 

 similar to actinomycosis. When the tumor is excavated, 

 with a number of fistulas discharging a pus that contains 

 "yellow grains," an opinion may be given without recourse 

 to the microscope. When the tumor is not ulcerated, and 

 when it is of long standing, localized lesions having the 

 appearance of actinomycosis are nearly always found in the 

 mouth. Bang refers to the possibility of confounding the 

 lesion at the beginning with an ordinary osteo-sarcoma, and 



Fig. S7. 

 Superior Maxila of an Ox Attacked with Actinomycosis. 



Morot reports the case of an ox exhibiting an osteo-sarcoma 

 of the maxilla that was first thought to be actinomycosis. 

 Mathis refers to a similar case in which an ulcerated sarcoma 

 of the extremity of the jaw bore a fairly exact resemblance 

 to the actinomycostic lesion. In the bovine pathological 

 department of the school at Lyons there is a specimen of 

 dental abscess at the extremity of the jaw that moi-e or less 

 resembles actinomycosis. 



With the exception of these cases'tliere-rs~rro~coiTfusion 

 possible, especially when the "yellow grains" are found in 

 the pus. 



(b) Actinomycosis of the Tongue. — When the lesion of 

 the tongue co-exists with a maxillary neoplasm the diagno- 



