Advances in the imaging of gastroenteropancreatic neuroendocrine neoplasms

Figure 2 Dual-energy computed tomography images of a 46-year-old man presenting with melena. A: Axial monochromatic computed tomography (CT) image at 55 keV in pancreatic phase shows a hyperenhancing well-defined mass (arrow) arising from the duodenal wall; B: Enhancement of the same lesion (arrow) appears subtle on the axial 100 keV monochromatic CT image; C and D: Iodine overlay maps show bright areas (arrow) suggesting contrast uptake (C), with iodine concentration of 3.2 mg/mL in areas of uptake (D). Iodine concentration of normal pancreas was 0.5 mg/mL.