The majority of people with<unk>  are not symptomatic, and the findings are an incidental imaging abnormality. In some, the x-ray findings may correspond to symptoms of back stiffness with flexion/extension or with mild back pain. Back pain or stiffness may be worse in the morning. Rarely, large anterior cervical spine osteophytes may affect the esophagus or the larynx and cause pain, difficulty swallowing or even dyspnea. Similar calcification and ossification may be seen at peripheral entheseal sites, including the shoulder, iliac crest, ischial tuberosity, trochanters of the hip, tibial tuberosities, patellae, and bones of the hands and/or feet.
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