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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

.

.

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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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.