From the case:
Synovial chondromatosis


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Apple core appearance as can be seen in right hip synovial chondromatosis.
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.