NEOPIvASMS. TUMORS OF THE I.UNG AND PLEURA. 



While tumors belong rather to surgery than medicine, yet 

 when present in the lung, they are as a rule inoperable and come 

 directly under the care of the physician who has almost complete 

 control of this organ. 



Fibroma. In the horse, Kitt mentions a single case of 

 fibromata, in size from a nut to a closed fist, encircling the root 

 of a lobe, so as to cause strangulation and collapse of the lung. 

 They were connected with the pleura and bronchia. A second 

 case recorded by Blanc, grew from the phrenic pleura. 



Fibrous neoplasms and nodules are common in all domestic 

 quadrupeds in connection with persistent inflammation (See 

 Chronic Fibrous Pneumonia. ) 



Sarcoma. Simple sarcoma is common in the lungs of horses, 

 cattle and dogs, scattered through the lung tissue, in horse 

 {Cadeac, Bruck, Perini,) or on the pleural surface (Adam, 

 DieckerhofI) ; in cattle in lung tissue and pleura, (I^eger, Hem- 

 minger, Morot), indog, in the lung and pleura, (Cadeac). The 

 lungs are very commonly involved in these small-celled fleshy 

 tumors when they have become generalized elsewhere. 



Melanoma. Pigmentary Sarcoma. These are very com- 

 mon in gray horses in which melanosis has become generalized. 

 In a recent case at the N. Y. S. Veterinary College, lungs and 

 and pleurae were plentifully sprinkled with melanotic deposits, 

 but beside this almost every organ in the body was involved. 

 Among gray horses, turning white or already white, these tumors 

 are well nigh universal and when generalized the lungs are usually 

 involved. Among other colors they are uncommon. 



In cattle melanosis is very rare. Gurlt, Hertwig and Fiorentini 

 notice black patches on the surface of the lungs in newborn 

 calves but these disappear as the animals grow. In dogs, I,afosse 

 describes pigmentary deposits in the form of black lines, but 

 pigmentation may be held to be the normal condition of the 

 surface of part of the canine lung and there need be no appre- 

 hension of this developing into a tumor. Briickmiiller and 

 Cadeac however record genuine pigment tumors of the lungs in 

 connection with melanosis of the lips. 



Carcinoma. These are common in the lung and even the 



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