Apple core sign (femur)

Last revised by Candace Makeda Moore on 2 Sep 2024

The apple core sign has been used to describe the circumferential erosion of the femoral neck seen in synovial chondromatosis. Although this is the most common process that may lead to an apple core erosion of the femoral neck, this sign has also been observed with various pathological processes effecting the synovial membrane including:

See also 

Cases and figures

  • Figure 1: apple core
  • Case 1
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