Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Eosinophilic granuloma
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A rounded lucent lesion is noted at the left occipital bone with double contour / beveled edge appearance.
Case Discussion
These 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.