Neoplasms. Tumors of the Lung and Pleura. 385 



Osteoma. Bony tumors have been especially noticed in the 

 lungs of cattle. The new formation having the resistance and 

 consistency of cancellated osseous tissue (Coremans). This may 

 be associated with the manifest tendency of tubercles to calcifi- 

 cation in these animals, and the ossification of the bronchial 

 rings in calves as noted by Kitt. In dogs, Cadeac records as a 

 frequent occurrence, the formation on the surface of the lung 

 and even throughout its substance of fine calcified granules, 

 giving a characteristic roughness to the pleural surface. They 

 are densely white and each surrounded by a thin zone of fibrous 

 tissue. Their cause is unknown, but probably they are connected 

 with parasitism or bacterial infection. 



Lipoma. Patty tumors have been found in the dog's lung, in 

 some cases generally desseminated through its substance (Sem- 

 mer). 



Symptoms of Pulmonary Tumors. These are generally in 

 the nature of interference with respiration in general, varying 

 in different cases according to the seat and bulk or the multiple 

 condition of the neoplasm, and again as to the nature and abun- 

 dance of the discharge. There is usually no attendant fever, and 

 the trouble has been slowly progressive rather than by sudden 

 access. It may be, and especially in the early stages, that no 

 symptom is shown when at rest, but the breathing is quickly dis- 

 turbed by active exertion. Under such circumstances, or in ad- 

 vanced stages, with extensive or numerous tumors, there may be 

 accelerated, difficult often catching breathing, dilated nostrils, 

 and even projecting eyeballs, a deep, painful cough occurring in 

 paroxysms, a loud ronchus if the bronchia are compressed or par- 

 tially filled, and a flatness on percussion in the seat of any large 

 tumor. In such a situation the normal respiratory murmur is ab- 

 sent, and there may be blowing sounds, mucous rales, heart 

 sounds, rumbling or gurgling from the transmission through the 

 solid body of sounds of distant organs. There may also be areas 

 of drumlike resonance on percussion and wheezing, in connection 

 with the development of emphysema. Nasal discharge may be 

 absent, or if the bronchia are involved it may be abundant, and 

 of various kinds. In melanosis there is more or less black liquid 

 in which the pigment granules or masses are clearly seen under 

 the microscope. In carcinoma the discharge may be bloody and 

 25 



