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Reactive soft-tissue mass associated with osteoid osteoma: correlation of MR imaging features with pathologic
E R Woods1, W Martel, S H Mandell
1Department of Radiology, University of Michigan Hospitals, Ann Arbor 48109.
Abstract:
The authors retrospectively reviewed three cases of histologically documented osteoid osteoma in which magnetic resonance (MR) imaging was performed prior to surgical excision. In all three cases, MR imaging demonstrated abnormal signal intensity characteristics, and use of gadopentetate dimeglumine resulted in enhancement. These findings correlated with a reactive soft-tissue mass with myxomatous change, as well as with cell-depleted, juxtanidal bone marrow that contained proteinaceous material. These MR imaging findings can easily be confused with those of a malignant tumor or osteomyelitis.
Insights
Magnetic resonance (MR) imaging of osteoid osteoma shows abnormal signal intensity and enhancement with gadopentetate dimeglumine. These findings may mimic malignant tumors or osteomyelitis, requiring careful interpretation.
Area of Science:
- Orthopedic Surgery
- Radiology
- Oncology
Background:
- Osteoid osteoma is a benign bone tumor.
- Accurate diagnosis is crucial to differentiate from malignant conditions.
- Magnetic resonance (MR) imaging is a key diagnostic tool.
Purpose of the Study:
- To describe the MR imaging characteristics of osteoid osteoma.
- To highlight potential diagnostic challenges in differentiating osteoid osteoma from other bone pathologies.
- To evaluate the utility of gadolinium-enhanced MR imaging in visualizing osteoid osteoma.
Main Methods:
- Retrospective review of three histologically confirmed osteoid osteoma cases.
- Analysis of pre-operative magnetic resonance (MR) imaging.
- Assessment of imaging findings, including signal intensity and contrast enhancement patterns.
Main Results:
- MR imaging revealed abnormal signal intensity in all three cases.
- Gadopentetate dimeglumine administration resulted in lesion enhancement.
- Imaging findings correlated with reactive soft-tissue masses and juxtanidal bone marrow changes.
- MR imaging findings mimicked malignant tumors or osteomyelitis.
Conclusions:
- MR imaging findings in osteoid osteoma can be mistaken for malignant tumors or osteomyelitis.
- Gadolinium enhancement is a notable feature in osteoid osteoma imaging.
- Radiologists must be aware of these potential mimics for accurate diagnosis.