Advances in Urology / 2012 / Article / Fig 3

Review Article

Recent Developments in Computed Tomography for Urolithiasis: Diagnosis and Characterization

Figure 3

A 42-year-old male with a history of renal calculi presenting with left flank pain. Noncontrast CT for the assessment of renal calculi in axial (a) and coronal (b) reformats. These images clearly show a large calculus in the left renal pelvis extending into the upper ureter as well as a second large calculus in the lower pole of the left kidney (arrows). Axial dual energy noncontrast CT images in the same patient showing iodine- (c) and water- (d) based attenuation. The calculus is visible on the iodine-attenuated image (c) and is unchanged when compared to the standard CT. However, the water-attenuated image (d) shows “dropout,” and the calculus is no longer visible. This indicates the presence of low-molecular-weight elements. Post removal, this stone proved to be predominantly composed of urate.

We are committed to sharing findings related to COVID-19 as quickly as possible. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. Review articles are excluded from this waiver policy. Sign up here as a reviewer to help fast-track new submissions.