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Case of the Week 605 
What is the most likely diagnosis?
- 47 year-old male with knee study unchanged in 4 years
Frontal and Lateral Radiographs of Left Knee
- Bone Infarct
- Enchondroma
- Giant Bone Island
- Metastasis from Renal Cell Carcinoma
- Osteopoikilosis
Additional Image - None
Additional Images
None
Answer:
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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The top diagnostic imaging diagnoses that all medical students should recognize according to the Alliance of Medical Student Educators in Radiology |
Recognizing normal and key abnormal intestinal gas patterns, free air and abdominal calcifications |
Recognizing the parameters that define a good chest x-ray; avoiding common pitfalls |
How to recognize the most common arthritides |
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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. |
