obsolete_Ovarian Yolk Sac Tumor true germ cell endodermal sinus tumor of the ovary germ cell endodermal sinus neoplasm of ovary yolk Sac neoplasm of ovary yolk sac tumor ovarian endodermal sinus tumor http://purl.obolibrary.org/obo/MONDO_0006344 ovarian germ cell endodermal sinus neoplasm ovarian germ cell endodermal sinus tumor endodermal sinus neoplasm of the ovary ovary yolk sac tumor ovarian yolk sac tumor germ cell endodermal sinus neoplasm of the ovary endodermal sinus tumor of ovary SCTID:254876005 3.88.0 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. endodermal sinus tumor of the ovary ovarian endodermal sinus neoplasm ONCOTREE:OYST EFO:1000437 germ cell endodermal sinus tumor of ovary NCIT:C8107 ovarian yolk Sac neoplasm Replaced by Mondo term MONDO_0006344, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006344 yolk Sac tumor of the ovary endodermal sinus neoplasm of ovary yolk Sac neoplasm of the ovary DOID:5350 UMLS:C0346188 yolk Sac tumor of ovary