How are Axial Spondyloarthritis and diffuse idiopathic skeletal hyperostosis different

How are Axial Spondyloarthritis and diffuse idiopathic skeletal hyperostosis different?

DISH, also called Forestier’s disease, is a noninflammatory disease occurring most commonly in obese, diabetic men aged >50 years. It is characterized by flowing hyperostosis (bone formation), calcification of the anterior longitudinal ligament of at least four contiguous vertebral bodies, and nonerosive enthesopathies (whiskerings).

The disease is not associated with sacroiliitis, apophyseal joint ankylosis, or HLA-B27. The flowing osteophytes in DISH typically occur on the right side of the spine, contralateral to the heart and aorta. On a lateral spine radiograph, a linear area of radiolucency typically exists between the calcified anterior longitudinal ligament and the anterior surface of the vertebra

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