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a Anteroposterior radiograph of the pelvis of a 6-year-old boy with a painful osteolytic lesion at the left ischial ramus. CT-guided frozen section biopsy showed eosinophilic granuloma; intralesional methylprednisolone injection was performed. b Anteroposterior radiograph of the pelvis shows complete reconstitution of the lesion 1 year after diagnosis and treatment
