MONDO_0002143 (vaginal yolk sac tumor) is a rare yolk sac tumor that arises from the vagina. Patients present with abnormal vaginal bleeding or bloody discharge. Also known as: vaginal endodermal sinus neoplasm, vaginal endodermal sinus tumor, vaginal endodermal sinus tumour, vaginal yolk Sac neoplasm, vaginal yolk Sac tumor, vaginal yolk Sac tumour.