Figure 25a. (a) Collimated frontal view of the lumbosacral junction shows a drop of Pantopaque contrast material (arrow) remaining from past myelography. Hemostatic clips and pedicle screws are also visible. (b) Collimated view of the upper abdomen in another patient shows Pepto-Bismol (arrows) in the stomach and jejunum. (c) CT scan of a third patient demonstrates lymphangiographic contrast material in the paracaval and paraaortic lymph nodes (arrows). (d) Frontal view of the pelvis in an elderly patient shows a colostomy (arrows), surgical clips from a prostate resection, and residual contrast material in scattered colonic diverticula.