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Case of the Week 453



What is the most likely diagnosis?

  • 47 year-old male with knee study unchanged in 4 years



Frontal and Lateral Radiographs of Left Knee

  1. Bone Infarct
  2. Enchondroma
  3. Giant Bone Island
  4. Metastasis from Renal Cell Carcinoma
  5. Osteopoikilosis

Additional Image - None

 

Additional Images

 

 

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Answer:

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3. Giant Bone Island

.

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More (Click Discussion Tab)

 

 

Giant Bone Island

 

General Considerations

  • Bone islands (enostoses) are areas of mature compact bone in cancellous bone in the medullary cavity
  • Usually oriented with its long axis parallel to the cortex
  • Most common in pelvis, proximal femurs and ribs
  • May change in size over time, but change usually takes years

 

MORE . . .

 


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