Left flank pain and haematuria
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Nonenhanced CT image shows an obstructing left distal ureteral calculus with left hydroureteronephrosis
This case shows an obstructing calculus in the left ureterovesical junction with a slight soft-tissue rim around the stone. This finding is indicative that the stone is inside the ureter.
The prone image shows that the stone is still in the distal ureter at the ureterovesical junction and that it has not passed into the bladder.