Tumors in Newborn Animals

Abstract

The literature on tumors in newborn animals is reviewed, and a description is given of eight cases of congenital tumors in calves. Two were cases of congenital lymphoid leukosis, in both of which the dams seemed to be healthy. Two fetuses showed extensive peritoneal mesotheliomas, and an aborted fetus had a subcutaneous lymphangioma on the lower leg. There were two cases of nephroblastoma, of which one was a fetus with one very large tumor and several smaller tumors in the abdominal cavity. The diagnosis of extranephritic nephroblastoma appears to be the first example of this type to be reported in an animal fetus. The last case described is that of a mixed mesenchymal tumor situated in the retroperitoneal tissues.