Figure 9b. Duodenal renal cell metastasis in a 70-year-old woman. (a) Follow-up early phase contrast-enhanced CT scan shows a hyperattenuating mass (long arrow) of the duodenum (arrowheads). The mass could be mistaken for an islet cell tumor of the pancreas (short arrow). (b) On a delayed phase contrast-enhanced CT scan, the duodenal mass is washed out (arrow). Arrowheads indicate the duodenum.