Sometimes firm, slightly tender lump on the bone can be felt through the skin.

[jasileana]

Sometimes bone cancer interferes with normal movements and can also weaken or cause bones to break.Causes of primary cancer of the bones  CogniQ are usually unknown however it has four types namely, Ewing sarcoma, chondrosarcoma, spindle cell sarcoma, and osteosarcoma. Apparently, the most common symptom of this type of cancer would be bone pain. Some people would think of it as arthritis pain in adults or growing pains in children, which is why it is not diagnosed early.Chondrosarcomas are malignant tumors of cartilage, usually developing in flat bones like the pelvis and shoulder blade. X-rays often reveal punctuate calcifications.  http://www.supplements4help.com/cogniq/