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Case of the Week 361




What's the most likely diagnosis?

  • 61 year-old with abdominal pain



Axial CT scan of the pelvis at bone window settings

  1. Crohn's disease
  2. Bilateral pelvic fractures
  3. Ureteral calculi
  4. Intraosseous pneumatocysts
  5. Paget's disease

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Answer:

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4. Intraosseous Pneumatocysts

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More (Click Discussion Tab)


Intraosseous Pneumatocysts

General Considerations

  • Almost always found in the ilium or sacrum, near the sacroiliac joint
    • Also in the spine, especially cervical spine associated with degenerative disease
  • Gas-containing
    • The gas is mostly nitrogen
  • Uncertain etiology
  • A communication with the joint is usually not visible

    More ...


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    is an award-winning educational website aimed primarily at medical students and radiology residents-in-training, containing  lectures, handouts, images, Cases of the Week, archives of cases, quizzes, flashcards of differential diagnoses and “most commons” lists, primarily in the areas of chest, GI, GU cardiac, bone and neuroradiology.