Intramedullary plasma cell myeloma occurring spontaneously in a dog.

Some human neoplasms are unknown in animals and there are animal tumors that have not been described in man. Included among the former are newgrowths of the myeloma type. Engelbreth-Holm (2) states that plasma cell leukemia and the related multiple myelomatosis has not yet been observed in lower animals. A survey of the veterinary literature discloses no references to intramedullary plasma cell myelomas in any domestic animal. A tumor of this type was recently encountered in a routine necropsy of a dog and this report, therefore, represents the first example of a spontaneous plasma cell myeloma in a lower animal.