_:vb50953685 . _:vb50953685 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5609926/"^^ . _:vb50953685 . _:vb50953685 . _:vb50953685 . _:vb50953685 . _:vb50953685 "An ovary sarcoma that arises from endometrial stromal tissue."^^ .