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bone tumour

osteoid osteoma

osteogenic tumor

Digital slides

- UI:857 - Osteoid osteoma

Definition: Osteoid osteoma is a benign bone-forming tumour with limited growth potential, inducing disproportionate pain

Clinical features

  • pain with nocturnal exacerbation, relieved by salicylates and NSAID
  • exquisite, localized tenderness

Localization

- most common in long bones (femur)
- virtually every bone (except sternum)

Radiology

- dense cortical sclerosis around a radiolucent nidus

  • rarely : target-like lesion (if central sclerosis)

Microscopy

  • central nidus :
    • connective tissue, with differentiating osteoblasts producing osteoid and sometimes bone, with or without osteoclasts
  • surrounding sclerotic bone

See also

- osteoid-forming lesions
- bone-forming lesions