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OSTEOID OSTEOMA

OSTEOID OSTEOMA. OSTEOID OSTEOMA. Small, benign bone lesion with a nidus of less than 2 cm surrounded by a zone of reactive bone. . AETIOLOGY. UNKNOWN. INCIDENCE. 1O% OF BENIGN BONE TUMOURS Male:Female 2:1 5-25 years Rare over 40 years. LOCATION. Proximal femur , Tibia

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OSTEOID OSTEOMA

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  1. OSTEOID OSTEOMA Osteoid osteoma

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

  3. AETIOLOGY UNKNOWN Osteoid osteoma

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

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

  6. CLINICAL • DULL PAIN • Worse at night • Relieved by aspirin • 10% spine  scoliosis • Other : Joint effusion, LLD, synovitis • Pain decreases by 18-30 months Osteoid osteoma

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

  8. Osteoid osteoma

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

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

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