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Value of Multislice Helical CT Scans and Maximum-Intensity-Projection Images to Improve Detection of Ureteral Stones at Abdominal Radiography

Bernard E. Van Beers1, Stéphane Dechambre1, Pierre Hulcelle1, Roland Materne1 and Jacques Jamart2

1 Department of Radiology, Université Catholique de Louvain, Saint-Luc University Hospital, Ave. Hippocrate 10, B-1200 Brussels, Belgium.
2 Center of Biostatistics and Medical Documentation, Université Catholique de Louvain, Mont-Godinne University Hospital, Ave. Thérasse 1, B-5530 Yvoir, Belgium.



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  		Fig. 1A. —54-year-old man with right renal colic. Transverse CT scan shows right ureteral stone (cross) and calcifications of right internal iliac artery.

 


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  		Fig. 1B. —54-year-old man with right renal colic. Maximum-intensity-projection image of urinary tract shows right ureteral stone (cross) and several other right pelvic calcifications.

 


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  		Fig. 1C. —54-year-old man with right renal colic. Magnified maximum-intensity-projection image shows right ureteral stone (long arrow) overlying sacrum, calcifications of right internal iliac artery (short arrows), and phleboliths.

 


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  		Fig. 1D. —54-year-old man with right renal colic. Abdominal radiograph shows faint density (arrow) corresponding to right ureteral stone. This stone was not detected on radiograph when viewed without MIP image.

 


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  		Fig. 2A. —45-year-old man with left renal colic. Transverse CT scan shows left ureteral stone (arrow) and more external and posterior phleboliths.

 


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  		Fig. 2B. —45-year-old man with left renal colic. Maximum-intensity-projection image shows left ureteral stone (arrow) and multiple phleboliths.

 


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  		Fig. 2C. —45-year-old man with left renal colic. Abdominal radiograph shows left ureteral stone (arrow) and phleboliths. Ureteral stone was not recognized on radiograph at initial reading.

 


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  		Fig. 3A. —19-year-old woman with left renal colic. Transverse CT scan shows left ureteral stone (arrow).

 


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  		Fig. 3B. —19-year-old woman with left renal colic. Maximum-intensity-projection image shows left ureteral stone (arrow) overlying sacrum.

 


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  		Fig. 3C. —19-year-old woman with left renal colic. Abdominal radiograph in slightly different projection from that of B shows left ureteral stone (arrow). This stone was not recognized on radiograph when viewed without MIP image because it projects onto sacrum.

 

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