title: Aneurysmal bone cyst presenting as a pelvic mass on sonographic examination.
mesh_terms: D000328:Adult; D001845:Bone Cysts / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007085:Ilium / Q000473:pathology; D010386:Pelvic Neoplasms / Q000175:diagnosis*; D011859:Radiography; D014463:Ultrasonography