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Fig. 10B. —43-year-old man with metastatic pancreatic islet cell neoplasm. Helical CT scan obtained at midpoint of late arterial or portal vein inflow phase shows marked peripheral rim enhancement of multifocal metastatic neoplasm. Note transient hepatic attenuation difference (solid arrows) adjacent to margin of several hepatic metastases. This difference is presumed to result from "sump" effect due to hypervascularity of metastatic neoplasms. Note primary pancreatic neoplasm (open arrow).