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variable depending on the amount of fat and the stage of evolution of hematopoietic tissue. 2 Active lesions appear isointense on T1-weighted images, hyperintense on T2weighted images, and show some enhancement after administration of intravenous contrast medium. Chronic lesions may show low signal intensity on T1-and T2weighted images without enhancement. On chemical shift imaging, these lesions usually appear hypointense on the in-phase images compared with that on opposed-phase images owing to the presence of iron. 5doi:10.7869/tg.366 fatcat:gpxddzyfzvhdzh4lbnnfrcj5h4