Tumours of bones malignant. Among primary malignant tumours allocate tumours from an osteal tissue (an osteosarcoma, a chondrosarcoma, a malignant tumour of huge cells) and not osteal parentage (a fibrosarcoma, a chordoma, an angiosarcoma, an adamantinoma). The Osteosarcoma arises more often during body height of bones, in the age of till 15 years, less often at later age. Clinical signs develop quickly: a pain, difficulty of movements, an anemia.

The chondrosarcoma arises in the age of 30-50 years in pelvic bones, a proximal department of a femur, ribs, a humeral bone, Grows slowly, reaches greater sizes. Thus the pain is marked not always, just as restriction of movements. Metastasises in lungs arise at late stages of illness. Occurrence of relapses is more characteristic. After radical operation 50 % of patients recover.

The malignant tumour of huge cells arises from good-quality (frequency of 10-20 %). Amazes epiphysises of long tubular bones. Surgical treatment is highly effective.

Fibrosarcoma - a rare variant of an osteal sarcoma. After operation the 5-years survival rate makes 15-40 %.

Chordoma - an osteal sarcoma of an embryonal parentage. Arises in the age of 40-60 years basically in final departments of a backbone. Grows slowly, squeezes nervous roots and a spinal cord. Metastasizes late and seldom. After operation occurrence of a recurrent tumor is possible.

The adamantinoma appears usually in bones (90 %) at patients 30 years are more senior, grows slowly. Operation often leads to treatment of patients.