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Langerhans cell histiocytosis. Sagittal skull radiograph (a) shows two lytic lesions (arrowheads) in the parietal skull, the largest one with an associated soft tissue component (thin arrow). Axial head CT images (b, c) in the bone and soft tissue windows in the same patient demonstrate an osseous destructive lesion in the left frontal calvarium with bevelled edges (dashed arrows) and a soft tissue component (thick arrows); pathology proven eosinophilic granuloma in a 4-year-old boy
