It can occur anywhere in the body, but commonly in the long bones and the spine. Diagnosis is by its typical appearance of a small dense lesion on X-rays. CT scan may be needed to delineate the lesion. Treatment is usually excision. Osteoblastoma is a small painful lesion, usually affecting the spine.
Treatment is by excison and bone grafting.
Examples of malignant tumors are as follows. Ewing's Sarcoma can occur anywhere in the body, and is very aggressive in its spread to the rest of the body. Treatment is by chemotherapy. Osteosarcoma occurs typically around the knee. It usually causes pain, and may be associated with a pathological fracture.