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Figure 7. Arterial stimulation and venous sampling in MEN 1. The patient had biochemical evidence of an insulinoma, but no tumor was identified at cross-sectional imaging. Digital subtraction angiogram shows two catheters being used for arterial stimulation and venous sampling. A secretagogue (calcium) is being injected through the catheter on the left side, which lies within the splenic artery. The second catheter lies within the right hepatic vein, where venous sampling is being performed to assess for a rise in hormone concentration following injection. (Courtesy of Philip Boardman, MD, John Radcliffe Hospital, Oxford, England.)
