PAPILLOMATOUS TUMOURS. 



415 



n.— PAPILLOMATOtJS TUMOURS 



Form a class of new formations of much interest, and are of 

 frequent occurrence. "Warts (verrucas) on the skin and on the 

 mucous membranes are instances of them. Warts consist of a 



thickening of the epidermis, pro- 

 duced by accumulation of its scales, 

 with hypertrophy of the papillae of 

 the true skin. 



These growths are found most 

 commonly in young animals, their 

 favourite seat being the under sur- 

 face of the abdomen, the genitals, 

 mammary glands, lips and eyelids. 

 In the dog they are often seen in 

 large numbers within the mouth, 

 appearing in a very short space of 

 time, and disappearing as quickly. 

 When they form on mucous mem- 

 branes, or when found about the 



Fia. 80. — Perpendicular section ,i ^^ j j i ^ 



of a papilla, from an acuminated ^^^^' ^^^7 ^^6 Called Condylomata. 



condyloma, after the addition of They are of the Same nature, but 



acetic acid. a. Vascular loop, in- ' ti. ' • . .^ .^ 



temai to which is fibrous tissue, ^^e sottcr in consistcnce than the 



forming the axis of the papilla, wart. 



Outside are nuclei, b. b. Basement _,, , -i i • 



membrane, c. c. Epidermic cells. J- hey may be TCmOVed by CXCl- 



250 diam.— (Wedl.) gjon or torsion ; twisting or pulling 



by the hand being very often sufficient. If they are found 

 within the sheath of the penis, or on the prepuce surrounding 

 the orifice of tlie urethra, the patient has to be cast, and the 

 whole mass of them removed by the cautery or knife, and their 

 seat caaierised. If this be not done, they are apt to grow again. 

 Warts sometimes grow to an immense size, and hansr like 

 bunches of onions below the animal's belly ; when cut into, they 

 are found not only to be warts, but also steatoma, or the subcuta- 

 neous fibrous tumours already described. Indeed, when this 

 kind of tumour breaks through the skin, it very closely resembles 

 a common wart. They are found in horses and cattle, and most 

 commonly in young animals. 



When in the mouth of the dog, they may be snipped off with a 

 pair of scissors ; their removal in this way is not succeeded by 



