bone island

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Related to bone island: enostosis

bone is·land

a macroscopic focus of cortical bone within medullary bone, commonly seen as a dense round or oval opacity on radiographs of the pelvis, femoral head, humerus, or ribs.
A benign focus of compact bone within cancellous bone, almost invariably an incidental finding, which can mimic an osteoblastic metastasis—e.g., from prostate cancer