Background: Unlike ordinary germ cell tumors of the ovary, squamous cell carcinoma arising in a dermoid affects elderly persons. Prognosis is poor when the disease has spread beyond the ovary.
Case: The case of a 67-year-old woman with stage III squamous cell carcinoma arising in a dermoid cyst of the ovary and extending to the serosa and myometrium of the uterus, pelvic peritoneum, the serosa, and muscularis of the distal ileum and penetrating entirely through the wall of the sigmoid is presented.