_:vb50951814 "url:http://www.nlm.nih.gov/medlineplus/ency/article/001252.htm"^^ . _:vb50951814 "url:http://www.umm.edu/ency/article/001252.htm"^^ . _:vb50951814 . _:vb50951814 "A bone resorption disease that has_material_basis_in hyperparathyroidism which results_in hyperactivity in osteoclasts, deformity, and loss of mass located_in bone."^^ . _:vb50951814 "url:http://en.wikipedia.org/wiki/Osteitis_fibrosa_cystica"^^ . _:vb50951814 . _:vb50951814 . _:vb50951814 . _:vb50951814 . _:vb50951814 . _:vb50951814 .