<unk>  <unk>  is a condition characterized by abnormal calcification/bone formation<unk>  of the soft tissues surrounding the joints of the spine, and also of the peripheral or appendicular skeleton. In the spine, there is bone formation along the anterior longitudinal ligament and sometimes the posterior longitudinal ligament, which may lead to partial or complete fusion of adjacent vertebrae. The facet and sacroiliac joints tend to be uninvolved. The thoracic spine is the most common level involved. In the peripheral skeleton,<unk>  manifests as a calcific enthesopathy, with pathologic bone formation at sites where ligaments and tendons attach to bone.
Diffuse idiopathic skeletal hyperostosis
Hereditary multiple exostoses
Giant-cell tumor of bone
Fibrous dysplasia of bone
Gerodermia osteodysplastica
Paget's disease of bone
Malignant infantile osteopetrosis
Pycnodysostosis