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Huge abdominal-pelvic mass measuring 19 x 18 x 10 cm, composed of solid and cystic elements interspersed with foci and streaks of fat and calcification. Mildly infiltrated mesenteric fat adjacent to left upper aspect with engorged vessels, perhaps due to mass effect; contiguous spread less probable. Uterus and right ovary appear normal, left ovary not demonstrated. Free fluid in paracolic gutters, normal-appearing appendix floating in fluid.
Findings most compatible with immature ovarian teratoma, probably originating from left ovary.