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Demonstration of a geode by magnetic resonance imaging: a new light on the cause of juxta-articular bone cysts in rheumatoid arthritis.
  1. E A Moore,
  2. R K Jacoby,
  3. R E Ellis,
  4. M E Fry,
  5. S Pittard,
  6. W Vennart
  1. Department of Physics, University of Exeter.


    The magnetic resonance imaging (MRI) features of a rheumatoid arthritic geode are presented. Development of such a cyst from before x ray diagnosis to its coalescence with the wrist joint is described. The evidence suggests that these juxta-articular cysts are not merely an intrusion of the synovial cavity into the bone marrow but start as isolated structures beneath the subchondral bone.

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