A sebaceous gland tumor of the ovary was detected in a 60-year-old woman who underwent right salpingo-oophorectomy for a right ovarian cyst. The cyst was unilocular, weighed 820 g, and was filled with sebaceous material containing a few hair shafts. There was a protruded mass composed of lobules of mature or immature sebaceous cells over the inner surface of the cyst wall. She has been well for 4 years and 2 months after the surgery. This is the second well-documented case of this extremely rare type of tumor. This lesion is teratogenic with unilateral development of the sebaceous glands and malignant characteristics are nil.
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