Osteoid osteoma
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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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