Osteoblastic bone lesion

Focal area of abnormally dense, hardened bone caused by an overgrowth of bone-forming cells. Possible causes are osteoblastic metastatic disease (prostate carcinoma, breast cancer, small cell lung cancer, Hodgkin lymphoma, and medulloblastoma), and benign conditions (healing fracture, osteomyelitis, bone islands/enostosis, Paget's disease).