Scoliosis secondary to osteoblastoma of the rib

An 8-year-old girl with a progressive, painless spinal deformity is presented. She was found to have an atypical scoliosis secondary to a stage 3 benign osteoblastoma of the rib. This case is presented to emphasize that atypical scoliosis in skeletally immature individuals requires a thorough investigation for an underlying cause.