Increased bone density is observed in the following conditions:
(1) Sclerotic hyperplasia: Sclerotic hyperplasia results from increased bone mass. It represents a compensatory response of the body and is seen in numerous diseases. Localized sclerotic hyperplasia occurs in chronic inflammation and malignant bone tumors. Generalized sclerotic hyperplasia is observed in conditions such as osteopetrosis, renal osteodystrophy, and fluorosis.Radiographically, this manifests as increased bone density, cortical thickening, enlarged bone shafts, narrowed or absent medullary cavities, and disappearance of trabeculae, presenting as dense images. Tumor bone in osteosarcoma shows hyperplasia and sclerosis, but this is not a compensatory response; rather, it constitutes part of the neoplastic tissue.Bone compression is most commonly seen in vertebral compression fractures and is also observed in avascular necrosis, where the increased density appears predominantly as an uneven pattern. (3) Intraosseous calcification: Intraosseous calcification can result from pathological bone lesions such as tumors, inflammatory tissue, bone marrow disorders, or ischemic diseases. It manifests as high-density, granular images lacking distinct structure.
(4) Abnormal Intraosseous Mineral Deposits: Substances like lead, phosphorus, and bismuth deposited within bones during growth primarily accumulate in the rapidly developing metaphysis, appearing as bands of increased density. These are less visible in adults.