title: A pelvic "doughnut" sign on three-phase bone scan.
mesh_terms: D000328:Adult; D001842:Bone and Bones / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008722:Methods; D010388:Pelvis / Q000000981:diagnostic imaging*; D049590:Postpartum Period; D011247:Pregnancy; D011877:Radionuclide Imaging