X-ray spine of a child is shown. What is the probable diagnosis?

Ans: (b) Rugger jersey spineRef: Radiology ReviewRUGGER JERSEY SPINEThe sclerotic bands on the superior and inferior endplates of the vertebral bodies represent accumulations of excess osteoid and appear opaque because of their increased volume when compared to normal bone.Rugger jersey spine describes the prominent subendplate densities at multiple vertebral levels to produce an alternating sclerotic-lucent-sclerotic appearance. This mimics the horizontal stripes of a rugby jersey, seen with secondary hyperparathyroidism* associated with Renal Osteodystrophy* and Osteopetrosis*.Bamboo spine is feature of ankylosing spondylitis*.Ivory spine is feature of Paget's disease*.RENAL OSTEODYSTROPHYCRF leading on to hyperparathyroidism.Signs of chronic renal failure:Findings of osteomalaciaHyperparathyroidismBone sclerosisRugger jersey spineRotting fence post appearance: Due to Rickets + HyperparathyroidismIn children, metaphyseal changes resembling rickets are seen, which together with cortical erosibons can give rise to the so-called 'rotting fence-post' appearance, particularly at the femoral neck.Looser's zone.