<unk> s are<unk>  tumors composed of well-differentiated derivations from at least two of the three germ cell layers (ectoderm, mesoderm, and endoderm). They affect a younger age group (mean patient age, 30 years) than epithelial ovarian neoplasms.<unk>  is the most common germ cell neoplasm and, in some series, the most common ovarian neoplasm. The tumors are bilateral in about 10% of cases. Most<unk> s are asymptomatic. Complications include rupture, malignant degeneration, or (most commonly) ovarian torsion.
Mature cystic teratoma
Gonadoblastoma
Ovarian fibroma
Teratoma
Nabothian cyst
Ovarian germ cell tumor
Endolymphatic sac tumor
Seminoma