57 year old with left flank pain for 12 hours. Urine sample 2+ for blood. White count at 14.

[Top]: Coronal CT shows the left kidney is enlarged, with angry-looking, inflamed, surrounding fat. The renal pelvis is dilated (hydronephrosis).

[Bottom]: Axial CT shows a small stone at the very end of the ureter (ureterovesicular junction).

Pretty straightforward case. For the nonmedical visitors, this is what we look for if your doc wants to get a CT for flank pain / kidney stone suspicion. See the other case for an ultrasound version.