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Chronic anaemia. Sagittal head CT (a) depicts widening of the diploic space (thick arrows). Axial T1-weighted (b), axial T2-weighted (c) and sagittal T1-weighted (d) images portray widening of the diploic space with generalised T1 and T2 marrow hypointensity (arrowheads) consistent with red marrow hyperplasia in this patient with sickle-cell anaemia
