564 



CLINICAL VETERINARY MEDICINE AND SURGERY. 



growths may even attain two inches in length, and three eighths to three 

 quarters of an inch in width at their base (Fig. 78). When detached 

 they are seen to have grown from a granular or fungous tissue. 

 Ulceration is not uncommon, and occurs most readil}' when the diseased 

 part has been exposed to injur}', or to repeated rubbing. 



In some cases the lesion occupies the subcutaneous tissue. It then 

 forms a growth of fibrous consistence, sometimes as large as a cherry. 

 At a later period the centre undergoes softening and is transformed 

 into a caseous magma. 



Finally, peculiar local growths are sometimes seen, which have 

 caused mistaken diagnosis; the tubercles develop in certain parts of 



Fig. 79. 



the feet, which become deformed and contorted, precisely as in the 

 cases described under the title of " gout in birds." 



The external lesions may, by their size and position, cause varying 

 functional disturbance. They may cover, or close the eyes (Fig. 79) ; 

 interfere with the movement of the mandibles, and when in the anal 

 region render defsecation difficult ; while those on the feet are usually 

 accompanied by muscular atrophy, and sometimes by paresis. 



Vegetations resembling the skin lesions may be seen on the buccal 

 mucous membranes ; sometimes they are simply hard, white or yellow- 

 ish, slightly prominent patches ; in others conical or rounded tubercles, 

 varying in size between a pea and haricot bean, considerablv dimin- 



