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Bone Tumor. Definition

Click here to learn more about the treatment of this disease and get complete information about other conditions: https://age2b.com/age2b-diseases More information on our website: https://bit.ly/3AwsmHw A bone tumor is the rapid, uncontrollable growth of tumor cells within a bone. Bone tumors are very rare; they constitute only 1% of all tumors. Bone tumors can be classified in different ways. One way to classify bone tumors is according to where the tumor initially begins. Primary bone tumors begin in bone or cartilage cells. Secondary bone tumors are metastatic. This means they spread to a bone from other malignant tumors in the body, such as from the breast, the lungs, or the colon. Most bone tumors are secondary, or metastatic, tumors. Another way to classify bone tumors is by the clinical behaviour and types of cells the tumor contains: whether or not the cells are malignant. This means how likely the cells are to spread to another area of the body, or to metastasize. If tumor cells are able to spread to other organs, through the blood or the lymphatic system, or directly, the tumor is known as a malignant tumor. If a tumor cannot spread or metastasize, it is benign, regardless of how big it may grow. Tumors can also be classified according to the histological tissue, from which they origin. There are more than 20 types of commonly known bone tumors. Much of the diversity in bone tumors is associated with their location. Long bones can be divided into three parts: the epiphysis, metaphysis and diaphysis. The epiphysis is made from cartilage and spongy bone. The metaphysis is made from highly vascularized spongy bone, and the diaphysis is made from dense, compact bone. Therefore, most of the tumors that grow from the epiphysis are cartilage-based. The most common of these tumors are chondromas. The most common cancer in the epiphysis of long bones is chondrosarcoma. The most common metaphyseal bone tumors are osteomas. Usually bone cancers here have a metastatic origin. The most common primary bone cancer of the metaphysis is osteosarcoma. Since the diaphysis is composed of dense bone tissue and has few bone cells, it is rarely affected by primary bone tumors. The most common tumor of this area is osteoma. Bone cancers here usually have a metastatic origin. The most common primary cancer in the diaphysis in children is Ewing sarcoma. In adults, the most common types are bone marrow tumors: plasmacytoma or multiple myeloma.