A favorite location for the papilloma in cattle is the udder and teats, where they may develop in such numbers as to cover the entire surface and make the animal troublesome to milk.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
A papilloma, when sessile, may simulate cancer; these tumours show a marked tendency to become malignant.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson