A 5-month-old, intact female, domestic shorthaired cat was presented for evaluation of abdominal distension. Abdominal radiographs revealed a midabdominal mass that contained multiple, irregular, mineralized opacities. The mass was surgically removed, and an ovariohysterectomy performed. The mass was located at the tip of the left uterine horn and was covered partially by haired skin. Histologically, the mass was diagnosed as a mature ovarian teratoma based on the presence of well-differentiated somatic structures derived from three primary embryonal germ-cell layers. Germ-cell tumor classification and feline ovarian teratomas are reviewed.
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