About 1 in 10 women will present an adnexal tumor in her life and most will require surgical evaluation to rule out a malignant nature considering that risk of malignancy increases with age. Objective: To determine the frequency and malignancy of adnexal tumors by age, location and malignancy. Design: Descriptive, cross-sectional study. Setting: Ginecology and Gynecologic Oncology Services, Hospital Nacional Arzobispo Loayza, Lima, Peru. Material: Histopathology registries. Methods: Review of histopathology results of 876 patients who had surgery in 2013-2014 for adnexal tumor, that included anexectomies, oophorectomies, hysterectomies with adnexectomy and both paratubarian and paraovaric tumors. Main outcome measures: Tumor frequencies, localization and malignancy. Results: Out of 876 adnexal tumors, 73% were ovarian pathology, 14% tubal and 13% paratubal; 7% (61) were malignant. From t...