Diffuse idiopathic skeletal hyperostosis affects spinal cord. Ossification of the longitudinal ligaments mainly the anterior ligaments of the spine produces a tortuous paravertebral mass anterior to and distinct at least radiologically from the vertebral bodies.
It was found in animals like baboons, monkeys, gorillas etc. and also even in dinosaurs. DISH is a completely asymptomatic phenomenon; no alterations are detectable based on history or through physical examination.
Symptoms may include pain, stiffness and restricted movements of the affected areas. Osteophytes may rarely cause symptoms by mechanical compression or by causing an inflammatory reaction.