Visualization of pancreatic pseudocyst.

In a 44-year-old woman, a pancreatic pseudocyst was demonstrated on delayed images obtained up to 8 days after the intravenous administration of 0.250 mCi 75Se-selenomethionine. The initial routine pancreas image study failed to visualize both the pancreas and the pancreatic pseudocyst. The diagnosis was confirmed at surgery and the fluid of the pancreatic pseudocyst contained 0.73% of the injected dose of the radioselenium.