Humeral head bone island
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No pathology of the lung is seen. Incidental finding: an oval sclerotic focus in the left humeral head, parallels the long axis of the bone, defined border, no periosteal reaction. Old fracture of the left 3rd rib.
These findings suggest bone island of the humeral head. Although if the patient has a cancer history, the differential diagnosis is an osteoblastic metastasis.