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Langerhans cell histiocytosis. A: Coronal T1-weighted image of the left femur shows a long segment of marrow T1 hypointensity (arrow) and cortical erosion/expansion (arrowhead); B: Sagittal short-tau inversion recovery image from the same patient shows very intense T2-signal in the marrow cavity (arrow). T2 hyperintensity in the periosteum (arrowhead) is indicative of periosteal reaction; C: Axial T1-weighted image post contrast shows intense enhancement of the periosteum (arrow).
