CT image showing liver iron overload.Notes: Axial nonenhanced CT image showing the liver with higher attenuation (*). A region of interest was placed in the liver and spleen green (circles). Attenuation of the liver and spleen were 78 HU and 44 HU, respectively. A hepatic attenuation higher than 71 HU has a specificity of 96% for iron overload. This is in contrast with the fatty liver seen in Figure 10.Abbreviations: CT, computed tomography; HU, Hounsfield units.