Diseases of the Mediastinum. 391 



or larger, are formed through the parenchyma. In exceptional 

 cases an abscess may attain to the size of a hen's egg and remain- 

 as a cold abscess, or burrow toward the pleura, pericardium, 

 bronchus, peritoneum or breast. 



From such enlarged glands a series of symptoms may arise 

 like those resulting from simple inflammation of the mediastinal 

 connective tissue ; or organization of the inflammatory exudate. 



The treatment of such cases is not hopeful unless the original 

 cause of irritation can be put a stop to, when in recent cases the 

 persistent use of iodide of potassium may reduce the glandular 

 hypertrophy. In old standing sclerosis of the glands no such 

 happy issue can be expected. 



Lymphadenoma may occur in connection with leucocytosis, 

 and produce all the evil results of compression enumerated above. 

 The symptoms would resemble those already mentioned and the 

 diagnosis would be completed by the excess of leucocytes in the 

 blood, and often by the pallor of the visible mucosae and swelling 

 of superficial lymph glands. In this case attention should be 

 given to hygiene, open air life, generous feeding and iron and 

 other tonics to build up the strength and increase the red 

 globules. 



Melanoma. In solipeds (the gray and white especially) and 

 less frequently in other genera, pigmentary deposits are found in 

 the mediastinal lymph glands, as in other parts, and as they 

 may grow to any size and show no limit as to numbers, the re- 

 sults are the same as in the other forms of compression above 

 described. Along with the general symptoms, the presence of 

 melanomata elsewhere and, in horses, the white or gray color 

 will serve to identify the melanotic formations. 



Sarcoma has been found in the cesophagean glands in cattle 

 (Bournay), papilloma on the pillars of the diaphragm (Pradal), 

 and cystoma at the root of the bronchi (Adenot) in the same 

 genus, and carcinoma is common to domestic animals generally. 



Ossifying Chondroma has been found by Nocard In the 

 mediastinum of the dog, and indeed any form of simple or malig- 

 nant neoplasm may be expected in this situation with a mani- 

 festation of more or less of the symptoms found in productive 

 inflammations. These may, one and all, be pronounced to be be- 

 yond reach of successful treatment. 



