_:vb50954782 "url:https://www.ncbi.nlm.nih.gov/pubmed/1996729"^^ . _:vb50954782 . _:vb50954782 "An ovarian benign neoplasm that is characterized by low beta-hCG levels and is has_material_basis_in glandular and fibrous tissues, with a relatively large proportion of glands."^^ . _:vb50954782 . _:vb50954782 . _:vb50954782 . _:vb50954782 .