Giant cell tumour
From the case:
Giant cell tumour
X-ray
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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 tumour.
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.