label: Ovarian Yolk Sac Tumor
label_lc: ovarian yolk sac tumor
description: A usually rapidly growing malignant germ cell tumor arising from the ovary.  It usually occurs in children and adolescents.  Signs and symptoms include abdominal pain and a large abdominal or pelvic mass.  The serum alpha-fetoprotein is almost always elevated preoperatively.  Morphologically, there is marked heterogeneity due to numerous patterns of differentiation coexisting in the same tumor.  The most common pattern is reticular.