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Lateral radiograph of the lumbosacral spine in a 12 year old obese girl with low back pain. Bilateral pars defects (middle arrow) are present and there is Grade I spondylolisthesis (bottom arrow) of L5 on S1. There is also evidence of Schmorl's nodes (top arrow) within the lower thoracic spine. (Radiograph courtesy of BC Children's Hospital).
