Osteoblastoma

**Definition:** A benign, painful, tumor of bone characterized by the formation of osteoid tissue, primitive bone and calcified tissue. It occurs frequently in the spine of young persons. (From Dorland, 27th ed; Stedman, 25th ed)

**Tree numbers:** - C04.557.450.565.575.600

**Synonyms:** - Giant Osteoid Osteoma - Osteoma, Giant Osteoid