A.K.: Canine ovarian tumors of germ cell origin

Abstract. Fourteen ovarian germ cell tumors were diagnosed in the dog-seven dysgerminomas and seven teratomas. Six of the teratomas had immature components and were judged malignant; three had metastasized. One dysgerminoma had metastasized. The dysgerminomas developed in dogs ten years of age and older, and the teratomas developed in dogs nine years old and younger. Primary ovarian tumors are generally classified as epithelial, germ cell, or sex cord-stromal tumors. In female dogs, germ cell tumors are much less common than the other major types.’.’’. l 2 Although there have been many reports of dysgerminoma~’,~.’.~. 12, 1 3 15.22.25 these are still consid-ered rare. This report describes seven dysgerminomas and seven teratomas (two of which have been reported previously’’) in the dog. and teratomas,4.h.8.Y. 1 I. 12. 18-20.23.24 Materials and Method