Osteosarcoma

**Definition:** A sarcoma originating in bone-forming cells, affecting the ends of long bones. It is the most common and most malignant of sarcomas of the bones, and occurs chiefly among 10- to 25-year-old youths. (From Stedman, 25th ed)

**Tree numbers:** - C04.557.450.565.575.650 - C04.557.450.795.620

**Synonyms:** - Osteogenic Sarcoma - Osteosarcoma Tumor - Sarcoma, Osteogenic