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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

OSTEOID OSTEOMA

Osteoid osteoma

osteoid osteoma1
OSTEOID OSTEOMA

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

Osteoid osteoma

aetiology
AETIOLOGY

UNKNOWN

Osteoid osteoma

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

Osteoid osteoma

location
LOCATION

Proximal femur , Tibia

Spine = posterior elements

diaphysis or metaphysis

Osteoid osteoma

clinical
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

radiology
RADIOLOGY
  • Radiolucent nidus
  • Surrounded by sclerotic bone
  • Center of nidus may be calcified
  • Hot spot on Tc - scan

Osteoid osteoma

differential diagnosis
DIFFERENTIAL DIAGNOSIS
  • Osteoblastoma
  • Brodie’s abscess
  • Fatigue fracture

Osteoid osteoma

pathology
PATHOLOGY
  • Nidus usually < 1 cm
  • Nidus = thick vasculas bars of osteoblastic tissue, surrounded by vascular fibrous tissue and mature reactive cortical bone

Osteoid osteoma

treatment
TREATMENT
  • NSAIDS
  • SURGICAL – excision
  • Percutaneous radiofrequency ablation

Osteoid osteoma

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