<prompt> Flowing wax appearance on anterior and posterior borders of veebrae with normal interveebral disc space occuring due to ligament calcification is seen in -Ankylosing spondylitisDiffuse idiopathic skeletal hyperophyPsoriatic spondyloahropathyRA  <response>: Radiological features of DISH Diffuse Idiopathic skeletal hyperostosis : Flowing calcification and ossification along the anterolateral aspect of veebral bodies. - Flowing wax appearance Preserved disc space. Absence of bony ankyosis of facet joints,absence of sacroiliac bony erosion,sclerosis or bony fusion. 