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Detection of Encrusted Indwelling Ureteral Stents Using a Twinkling Artifact Revealed on Color Doppler Sonography

Hervé Trillaud1, Jean-Louis Pariente2, Abdelhack Rabie1 and Nicolas Grenier1

1 Service de Radiologie, Groupe Hospitalier Pellegrin, Place Amélie Raba-Léon, 33076 Bordeaux Cedex, France.
2 Service d'Urologie, Groupe Hospitalier Pellegrin, 33076 Bordeaux Cedex, France.



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  		Fig. 1A. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. B-mode sonograms of upper intrarenal (A) and lower intravesical (B) extremities of right ureteral stent show thickening of stent. Note highly echogenic pattern and acoustic shadowing.

 


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  		Fig. 1B. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. B-mode sonograms of upper intrarenal (A) and lower intravesical (B) extremities of right ureteral stent show thickening of stent. Note highly echogenic pattern and acoustic shadowing.

 


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  		Fig. 1C. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. Color Doppler sonograms reveal large twinkling artifact despite high color velocity scale.

 


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  		Fig. 1D. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. Color Doppler sonograms reveal large twinkling artifact despite high color velocity scale.

 


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  		Fig. 1E. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. Magnified unenhanced radiographs of upper (E) and lower (F) extremities of stent show gross encrustation.

 


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  		Fig. 1F. —33-year-old pregnant woman (8 months) with gross encrustation of ureteral stent. Magnified unenhanced radiographs of upper (E) and lower (F) extremities of stent show gross encrustation.

 


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  		Fig. 2A. —40-year-old pregnant woman (6 months) with thin encrustation of ureteral stent. Color Doppler sonogram of intravesical extremity of stent shows thin twinkling artifact only at posterior aspect of tube itself.

 


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  		Fig. 2B. —40-year-old pregnant woman (6 months) with thin encrustation of ureteral stent. Magnified unenhanced radiograph of lower end of stent shows thin calcified rim (arrows).

 

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