<unk>  is a malignant (cancerous) tumor of the<unk>  that destroys normal<unk>  tissue (1). Not all<unk>  tumors are malignant. In fact, benign (noncancerous)<unk>  tumors are more common than malignant ones. Both malignant and benign<unk>  tumors may grow and compress healthy<unk>  tissue, but benign tumors do not spread, do not destroy<unk>  tissue, and are rarely a threat to life.
Malignant tumors that begin in<unk>  tissue are called primary<unk> . Cancer that metastasizes (spreads) to the<unk> s from other parts of the body, such as the breast, lung, or prostate, is called metastatic cancer, and is named for the organ or tissue in which it began. Primary<unk>  is far less common than cancer that spreads to the<unk> s.
Bone cancer
Bone metastasis
Osteomyelitis
Osteoma
Osteochondrosis
Osteopetrosis
Parathyroid cancer
Osteoporosis