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Osteoid osteoma: MR imaging versus CT

J Assoun1, G Richardi, J J Railhac

  • 1Department of Radiology, CHU Toulouse Purpan, France.

Radiology
|April 1, 1994
PubMed
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Computed tomography (CT) is superior to magnetic resonance (MR) imaging for diagnosing osteoid osteoma, particularly in identifying the nidus. While MR imaging shows surrounding changes, CT remains the gold standard for definitive diagnosis.

Area of Science:

  • Radiology
  • Orthopedic Imaging
  • Oncology

Background:

  • Osteoid osteoma is a benign bone tumor.
  • Accurate diagnosis is crucial for appropriate treatment.

Purpose of the Study:

  • To compare the diagnostic performance of computed tomography (CT) and magnetic resonance (MR) imaging for osteoid osteoma.
  • Evaluate the ability of each modality to detect the nidus and adjacent soft tissue or bone changes.

Main Methods:

  • Nineteen patients with histologically confirmed osteoid osteoma underwent both CT and MR imaging prior to surgical excision.
  • Image analysis focused on lesion conspicuity, nidus detection, and assessment of perilesional marrow, soft tissue, and synovial alterations.

Main Results:

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  • CT demonstrated higher accuracy in detecting the osteoid osteoma nidus in 63% of cases compared to MR imaging.
  • MR imaging excelled in visualizing intramedullary and soft-tissue changes, though this could lead to misinterpretation of lesion aggressiveness.
  • A significant correlation was observed between the presence of marrow/soft-tissue changes and anti-inflammatory medication use (P < .05).

    • Conclusions:

    • Computed tomography is the preferred imaging modality for the diagnosis of osteoid osteoma.
    • Magnetic resonance imaging findings, especially concerning adjacent changes, should be interpreted cautiously and in conjunction with CT and plain radiographs to prevent diagnostic errors.