Osteoma, Osteoid

**Definition:** A benign osteoblastic tumor with central vascularized nidus surrounded by normal reactive bone. It occurs especially in second decade of life most commonly in the femoral neck but can occur in any bone and any site within a bone.

**Tree numbers:** - C04.557.450.565.575.625.625

**Synonyms:** - Osteoid Osteoma