Right sided abdominal / loin pain.
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Non-contrast CT obtained with the patient prone, demonstrates a 4mm calculus in the right ureter at the level of the L3/4 disc. It is associated with mild hydronephrosis and extensive peri-ureteric and peri-renal stranding.
At the upper pole of the right kidney is what presumably represents a simple cyst.
The left kidney has a number of small calculi.
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This patient went on to pass the stone spontaneously, without additional imaging.