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Myositis ossificans: MR appearance with radiologic-pathologic correlation.

M J Kransdorf1, J M Meis, J S Jelinek

  • 1Department of Radiologic Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000.

AJR. American Journal of Roentgenology
|December 1, 1991
PubMed
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Magnetic resonance imaging (MRI) reveals characteristic appearances of myositis ossificans, aiding in differentiating it from malignancy. This study correlates MRI findings with histology and other imaging modalities.

Area of Science:

  • Radiology
  • Orthopedic Imaging
  • Soft Tissue Pathology

Background:

  • Myositis ossificans is a benign condition that can mimic malignancy on imaging.
  • Accurate diagnosis is crucial to avoid unnecessary interventions.

Purpose of the Study:

  • To correlate the magnetic resonance (MR) imaging appearance of myositis ossificans with histologic findings.
  • To compare MR imaging with other radiologic studies in the evaluation of myositis ossificans.

Main Methods:

  • Retrospective review of MR images from eight histologically confirmed cases of myositis ossificans.
  • Correlation of MR findings with histology, plain radiographs, CT scans, and arteriograms.

Main Results:

  • T2-weighted MR images showed well-defined, inhomogeneous lesions with intermediate to high signal intensity.

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  • Histology correlated with MR findings, showing a proliferating core and surrounding osteoblasts.
  • Early lesions exhibited edema, while mature lesions showed fat signals between bone trabeculae.

    • Conclusions:

    • The MR appearance of myositis ossificans varies with its stage and correlates with histologic changes.
    • Understanding these MR characteristics is vital for distinguishing myositis ossificans from malignant tumors.