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Benign ovarian teratomas (dermoids) are common, typically occur prior to menopause, and are often diagnosed incidentally. Historically, most dermoids were surgically removed; now, expectant management is increasingly frequent. In this retrospective cohort study at a single Spanish hospital from 2003 through 2013, researchers followed asymptomatic women with sonographically diagnosed benign ovarian dermoids. All ultrasounds were interpreted by physicians with >15 years' experience focused on gynecologic ultrasonography. Among 613 women with dermoid diagnoses, surgery was performed within 4 weeks in 205; the remaining 408 (mean age, 37; range, 14–81; 11% postmenopausal) were followed expectantly with follow-up scans at 3 and 6 months and annu…