- Etiology: benign tumor containing osteoid in a stroma of loose vascular connective tissue
- Radiograph: < 2 cm in size, femur / tibia / humerus most common, usually in cortex, central calcification, small radiolucent nidus with reactive sclerosis, periosteal new bone, if in spine posterior elements has sclerotic pedicle on ipsilateral side and scoliosis convex away from side of tumor
- Bone scan: increased uptake, useful for intraoperative localization
- CT: small lucent nidus that may contain calcification surrounded by sclerosis
- MRI: radiolucent nidus (T2 hyperintense), surrounding sclerosis (T2 hypointense)
- Clinical: age range 6 – 17 years old, pain relieved by NSAIDs, in spine causes painful scoliosis
Radiology Cases of Osteoid Osteoma


