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Used in the following article:

  • Apple core sign (femur) - “ The apple core sign has been used to describe the circumferential erosion of the femoral neck seen in synovial chondromatosis. Although this is th...”
  • Apple core sign (colon) - “ The apple core sign, also known as the napkin ring sign (bowel), is most frequently associated with constriction of the lumen of the colon by a st...”

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