Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Giant cell tumor
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Frontal

Two views of the knee demonstrate a lucent lesion located eccentrically within the distal lateral femur, abutting the articular surface.
Case Discussion
Lesion is consistent with a giant cell tumor.
The images are from Dr. John Hunter's amazing MSK collection. Dr. John Hunter is a professor in the department of radiology (musculoskeletal section) at UC Davis School of Medicine.
This case was donated to Radiopaedia.org by Radswiki.net.