Mesotheliomas are rare in animals but occur spontaneously in many different species, including cattle, dogs, cats, swine, and horses (1,2), as well as in rats (3), blue foxes (4), and goats (1). In the bovine species, these tumors are more frequently observed in calves than in adults (1,2) and are considered to be congenital in young animals. Mesothelial tumors can take 2 different histologic p...
