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Diagnostic Value of Attenuation Measurements of the Kidney on Unenhanced Helical CT of Obstructive Ureterolithiasis

Suzan M. Goldman1, Salomão Faintuch1,2, Sergio A. Ajzen1,3, Dejaldo M. J. Christofalo1,3, Marcelo P. Araújo1, Valdemar Ortiz4, Miguel Srougi4, Philip J. Kenney5 and Jacob Szejnfeld1

1 Department of Radiology, Federal University of São Paulo School of Medicine, Rua Napoleão de Barros 800, São Paulo CEP 04024-002, Brazil.
2 Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave., Boston, MA 02215.
3 Department of Radiology, Hospital do Rim e Hipertensão UNIFESP, Rua Borges Lagoa 960, São Paulo CEP 04038-002, Brazil.
4 Department of Urology, Federal University of São Paulo School of Medicine, Rua Napoleão de Barros 715/2, São Paulo CEP 04024-002, Brazil.
5 Department of Radiology, University of Alabama at Birmingham, 619 S 19th St., Birmingham, AL 35233.



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  		Fig. 1. —39-year-old woman with right-sided flank pain. Unenhanced CT scan shows high-attenuation calculus (large arrow) in right ureter. Note periureteral edema and periureteral fat stranding (small arrows).

 


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  		Fig. 2A. —50-year-old man with left-sided flank pain. Unenhanced CT scan shows corticomedullary placement of elliptical region of interest (ROI) to measure attenuation values in upper part of kidneys.

 


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  		Fig. 2B. —50-year-old man with left-sided flank pain. Unenhanced CT scan shows analogous ROI placement in middle part of kidneys.

 


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  		Fig. 2C. —50-year-old man with left-sided flank pain. Unenhanced CT scan shows analogous ROI placement in lower part of kidneys.

 

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