A variety of neoplastic and nonneoplastic disorders that occur in the ovary. Ovarian neoplasms are of greater diversity in histologic appearance and biologic behavior than for any other organ. The nonneoplastic disorders include physiologic cysts, pregnancy luteomas, and polycystic ovarian disease (Stein-Leventhal syndrome). The ovary can also be a site of metastasis from malignant tumors originating in the genital tract, breast, and gastrointestinal tract.