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Fig. 6B. —Nonfunctioning islet cell tumor in 45-year-old woman with history of abdominal pain. Diagnosis of benign nonfunctioning islet cell tumor was established at pancreaticoduodenectomy. Axial CT image obtained at same level as A in venous phase of enhancement shows that mass (arrow) has become nearly isoattenuating relative to pancreas and is nearly inconspicuous except for subtle ring enhancement. This enhancement pattern is unusual for adenocarcinoma and islet cell tumors.