Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
A one year old filly was admitted on Dec. 2, 1956, with a spherical mass of granulation tissue 5 inches in diameter on the right hind fetlock. A similar mass was removed surgically about 9 months previously, but grew back because of constant movement of the fetlock and poor circulation of the lower limb.
Maney, B. D.
"A Skin Graft in the Equine,"
Iowa State University Veterinarian: Vol. 19
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol19/iss2/7