Abstract
A clinical case of an 11-year-old bitch with unilateral ovarian dysgerminoma and pyometra is described. The owner reported purulent discharge from external genitalia, fastidious appetite and depression. Transabdominal ultrasonography of the reproductive organs showed a hypoechoic mass in the region of the left ovary (7.18 × 6.65 cm) and a strongly enlarged uterine lumen full of anechoic fluid. Vaginal cytology demonstrated about 50% superficial cornfield epithelial cells and multiple neutrophils. Complete blood counts and blood biochemistry analysis indicated a significant leukocytosis and a mild anemia. Blood progesterone (3.96 ng/ml) and estradiol (86 pg/ml) were assayed. Median laparotomy revealed an enlarged uterus, substantially altered left ovary, of the size of a grapefruit. The right ovary was of normal size and structure. Tumor metastases in other organs were not seen. Histologically, diffusely located cancer cells resembling primitive germ cells, specific for dysgerminomas, were established. One year after the surgery, according to the owner the dog is vital, with normal appetite and without general condition abnormalities.