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Figure 1a. A comparison of MR cholangiopancreatographic images shows the value of oral ferumoxsil. (a) Image obtained without secretin and ferumoxsil shows high signal intensity in the fluid-distended stomach (arrow) and small bowel (arrowhead) that obscures the pancreatic ducts. (b) Image obtained with the use of oral ferumoxsil (Gastromark; Mallinckrodt) as a negative contrast material shows a near absence of signal from the stomach and duodenum, a condition that allows better visualization of the pancreatic (arrow) and biliary ducts.
