Osteoid osteoma

  • Children and adolescents
  • 2nd decade of life
  • Pain at night, relieved by aspirin or other NSAIDs
  • Usually in tubular bones, often in vertebrae (painful scoliosis, dense pedicle)
  • Can be polyostotic
  • Surgery – main stay
  • RFA and HIFU also used nowadays for treatment
  • Plain film
    • Central nidus, surrounding sclerotic reaction
    • Nidus may have calcification
  • MRI
    • Soft tissue or bone marrow edema around lesion may be sometimes seen in MRI
    • Mixed signal from nidus
    • Low signal in all sequence around nidus due to sclerosis
  • Skeletal scintigram
    • Focal hypervascularity, high uptake
    • Negative scintigram rules out osteoma
Read more

Chai, Jee Won, et al. “Radiologic diagnosis of osteoid osteoma: from simple to challenging findings.” Radiographics 30.3 (2010): 737-749.

Napoli, Alessandro, et al. “Osteoid osteoma: MR-guided focused ultrasound for entirely noninvasive treatment.” Radiology 267.2 (2013): 514-521.