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Nonobstructing Renal Stones on Unenhanced CT: A Real Cause for Renal Colic?

Alessandro Furlan1,2, Michael P. Federle1, Donald M. Yealy3, Timothy D. Averch4 and Karen Pealer1

1 Department of Radiology, University of Pittsburgh Medical Center (Presbyterian Campus), 200 Lothrop St., Rm. 3950 CHP MT, Pittsburgh, PA 15213.
2 Present address: Institute of Radiology, University of Udine, Udine, Italy.
3 Department of Emergency Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA.
4 Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, PA.


Figure 1
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  		Fig. 1 —76-year-old man who presented to emergency department with right renal colic. Transverse CT scan shows 8-mm nonobstructing stone (arrow) in right renal pelvis. Note absence of signs of obstruction such as hydronephrosis or perinephric fat stranding.

 

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  		Fig. 2 —36-year-old woman with history of 10 emergency department evaluations for right renal colic. Transverse CT scan shows 2-mm nonobstructing stone (arrow) in right kidney. Note absence of signs of obstruction such as hydronephrosis or perinephric fat stranding. Same stone was seen in same location on all CT scans. No other cause was ever established to explain patient's symptoms.

 

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