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DESCRIPTION OF AN ENCHONDROMATOUS TUMOUR 
FOUND IN THE LUNG OF AN ASS. 
By John Darcey Peach, Jun., Student at the Edinburgh 
Veterinary College. 
The morbid specimen to which the following observations 
refer was taken from the left lung of an aged ass, while un- 
dergoing dissection. Regarding the animal’s previous history 
nothing was known, and at the time of purchase no inquiries 
were instituted ; neither when destroyed for dissection did it 
present any peculiarities of appearance, save and except the 
usual accompaniments and indications of great age. 
Enchondroma affects both the hard and the soft tissues, but 
is more frequently found associated with the former than the 
latter. When the diseased product is found unattached to bone, 
it is most commonly developed in glandular structures, such as 
the mammse, parotid glands, testicles, &c. Although, strictly 
speaking, the lungs cannot, perhaps, be considered glandular in 
structure, yet they present, anatomically as well as physiolo- 
gically, many characteristics which glandular structures in com- 
mon possess, and, we find, are occasionally the site of tumours 
to which also glands generally are liable. So far, however, as 
can be ascertained from the writings of authors on veterinary 
medicine, no mention has been made of the lungs being the 
occasional site of enchondromatous tumours. 
The morbid specimen under notice was taken from the supe- 
rior surface, about three inches posterior to the root of the left 
lung. Its upper part was invested by the pulmonary pleura, 
but below was completely imbedded in the lung; and was 
closely invested by condensed areolar tissue, disposed in layers 
so distinctly, that three separate folds were readily stripped off 
with the forceps. The tumour presented, after the removal of 
its investing tunics, an irregularly nodulated and oval shape. 
Its irregularities of surface consisted of four considerable emi- 
nences, between which were numerous smaller ones, separated 
more or less completely by depression taking a waving direc- 
tion, containing areolar tissue and a few bloodvessels. Its 
colour is greyish white, approaching to that of ordinary cartilage 
when invested by perichondrium. Its anterior end was darker 
in hue and softer in consistence than other portions of the sur- 
face, and was perforated by a bloodvessel. It weighed eighty- 
four drachms avoirdupois. Its circumference on its short axis 
measured seven and a half inches, and its long circumference 
eight and a half : its transverse diameter, on being exposed by 
