1. OSTEOID OSTEOMA
July 2012
Osteoid osteoma

2. OSTEOID OSTEOMA
Small, benign bone lesion with a nidus of less than 2 cm surrounded by a zone of reactive bone.
July 2012
Osteoid osteoma

3. AETIOLOGY
UNKNOWN
July 2012
Osteoid osteoma

4. INCIDENCE 1O% OF BENIGN BONE TUMOURS Male:Female 2:1 5-25 years
Rare over 40 years
July 2012
Osteoid osteoma

5. LOCATION
Proximal femur , Tibia Spine = posterior elements diaphysis or metaphysis
July 2012
Osteoid osteoma

6. CLINICAL DULL PAIN Worse at night Relieved by aspirin
10% spine  scoliosis
Other : Joint effusion, LLD,
synovitis
Pain decreases by months
July 2012
Osteoid osteoma

7. RADIOLOGY Radiolucent nidus Surrounded by sclerotic bone
Center of nidus may be calcified
Hot spot on Tc - scan
July 2012
Osteoid osteoma

8. July 2012
Osteoid osteoma

9. DIFFERENTIAL DIAGNOSIS
Osteoblastoma
Brodie’s abscess
Fatigue fracture
July 2012
Osteoid osteoma

10. PATHOLOGY Nidus usually < 1 cm
Nidus = thick vasculas bars of osteoblastic tissue, surrounded by vascular fibrous tissue and mature reactive cortical bone
July 2012
Osteoid osteoma

11. TREATMENT NSAIDS SURGICAL – excision
Percutaneous radiofrequency ablation
July 2012
Osteoid osteoma