Editing Bone tumor (section)

===Secondary bone tumors===
Secondary bone tumors are [[metastasis|metastatic]] [[lesion]]s which have spread from other organs, most commonly carcinomas of the breast, lung, and prostate. Rarely, primary bone malignancies such as [[osteosarcoma]] may also spread to other bones.<ref>{{cite web|url= https://www.lecturio.com/concepts/osteosarcoma/|title= Osteosarcoma|website= The Lecturio Medical Concept Library|access-date= 26 August 2021|archive-date= 25 August 2021|archive-url= https://web.archive.org/web/20210825062514/https://www.lecturio.com/concepts/osteosarcoma/|url-status= live}}</ref>
Reliable and valid statistics on the incidence, prevalence, and mortality of malignant bone tumours are difficult to come by, particularly in older adults (those over 75 years of age) - because [[carcinomas]] that are widely metastatic to bone are rarely ever curable. Biopsies to determine the origin of the tumour in cases like this are rarely done.{{citation needed|date=June 2021}}