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Intraosseous Lipoma

  • Intraosseous lipoma is a rare benign tumor: To date, only 13 cases have been reported to involve the sphenoid bone.
  • Furthermore, accurate identification of this lesion is important to avoid surgery.
  • Key Diagnostic Features:
    • On MRI, this lesion shows signal characteristics of fat — ie, it is hyperintense — on T1WI and T2WI, signal drop on fat saturation sequence, and no enhancement following contrast administration.
    • On CT, this lesion demonstrates fat attenuation with well defined bony margins.
  • The tumor is divided into 3 stages:
    • Stage I: Solid lesions demonstrate viable fat.
    • Stage II: Transitional lesions contain regions of viable fat and fat necrosis, as well as areas of dystrophic calcification.
    • Stage III: They show involutional changes with extensive fat necrosis, cyst formation, calcification, and reactive new bone formation.
  • Likewise, they have variable CT and MRI appearances according to stage.
  • Rx: Incidental finding
November 17, 2014
A 60-year-old man with metastatic left tonsillar squamous cell cancer underwent a staging MRI neck and CT head examination.
View Case
  • Read more about 11172014
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