Imaging of Urinary System Trauma.

Computed tomography (CT) imaging of the kidney, ureter, and bladder permit accurate and prompt diagnosis or exclusion of traumatic injuries, without the need to move the patient to the fluoroscopy suite. Real-time review of imaging permits selective delayed imaging, reducing time on the scanner and radiation dose for patients who do not require delays. Modifying imaging parameters to obtain thicker slices and noisier images permits detection of contrast extravasation from the kidneys, ureters, and bladder, while reducing radiation dose on the delayed or cystographic imaging. The American Association for the Surgery of Trauma grading system is discussed, along with challenges and limitations.