FIGURE 9.

Normal renal anatomy as seen in CT urography in a 14-year-old boy. A, Coronal noncontrast CT image reveals the outline of the kidneys and is useful in identifying stones and calcifications (when present). B, Coronal CT postcontrast image by using a split-bolus technique (which allows for the evaluation of the renal cortex and collecting system in a single set of images) reveals the normal enhancement of the cortex as well as the contrast within the collecting system, properly delineating the calyces (yellow arrow) and renal pelvis (magenta star).