Some of the vertebrae with hyperdense shadows on breast cancer examination may be tumors or benign diseases such as bone islands. 1. Tumor: solid tumors such as breast cancer may also metastasize to the vertebral body, leading to bone destruction or osteophytes.CT films may show low-density shadows or high-density shadows. 2. Bone island: Bone island, also known as bone plaque, is caused by abnormal development of bone, which may be found in the vertebral body in the form of bird’s nest, dense bone tissue clumps or bone nodules within cancellous bone, and it may also show vertebral high-density shadows on CT films. Therefore, if part of the vertebral hyperdense shadow is found in the breast cancer examination, it is also necessary to carry out whole-body bone scanning examination for clarification, and if necessary, carry out PET-CT examination, and according to the results of the examination, further treatment will be carried out.