The Value of “Liver Windows” Settings in the Detection of Small Renal Cell Carcinomas on Unenhanced Computed Tomography Kamal Sahi, MD, Stuart Jackson,

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The Value of “Liver Windows” Settings in the Detection of Small Renal Cell Carcinomas on Unenhanced Computed Tomography Kamal Sahi, MD, Stuart Jackson, PhD, FCCPM, Edward Wiebe, MD, FRCPC, Gavin Armstrong, MB BCh, MRCP, FRCR, Sean Winters, MD, FRCPC, Ronald Moore, MD, PhD, FRCSC, FACS, Gavin Low, MBChB, MRCS, FRCR Canadian Association of Radiologists Journal Volume 65, Issue 1, Pages 71-76 (February 2014) DOI: 10.1016/j.carj.2012.12.005 Copyright © 2014 Canadian Association of Radiologists Terms and Conditions

Figure 1 A graph that shows received receiver operating characteristic curves of soft tissue windows and liver windows for the detection of small renal tumours on unenhanced computed tomography. AUC = area under the curve. Canadian Association of Radiologists Journal 2014 65, 71-76DOI: (10.1016/j.carj.2012.12.005) Copyright © 2014 Canadian Association of Radiologists Terms and Conditions

Figure 2 (A) An axial unenhanced computed tomography (CT) image acquired in conventional soft tissue windows (width, 400 Hounsfield units [HU]; level, 40 HU) of a 57-year-old woman with abdominal pain. The pathologically confirmed renal cell carcinoma (arrow) in the anterolateral aspect of the left kidney is poorly visualized on this image. (B) A corresponding axial unenhanced CT image of the same patient acquired in liver windows (width, 150 HU; level, 88 HU). The pathologically confirmed renal cell carcinoma (arrow) in the anterolateral aspect of the left kidney is better depicted as a focal area of decreased attenuation compared with the adjacent normal renal parenchyma. Canadian Association of Radiologists Journal 2014 65, 71-76DOI: (10.1016/j.carj.2012.12.005) Copyright © 2014 Canadian Association of Radiologists Terms and Conditions

Figure 3 (A) A coronal-unenhanced computed tomography (CT) image acquired in conventional soft tissue windows (width, 400 Hounsfield units [HU]; level, 40 HU) of a 49-year-old woman with right upper quadrant abdominal pain. The pathologically confirmed renal cell carcinoma (arrow) in the lateral aspect of the right kidney is poorly visualized on this image, albeit causing mild bulging of the renal contour. (B) A corresponding coronal unenhanced CT image of the same patient acquired in liver windows (width, 150 HU; level, 88 HU). The pathologically confirmed renal cell carcinoma (arrow) in the lateral aspect of the right kidney is better depicted as a focal area of decreased attenuation compared with the adjacent normal renal parenchyma. Canadian Association of Radiologists Journal 2014 65, 71-76DOI: (10.1016/j.carj.2012.12.005) Copyright © 2014 Canadian Association of Radiologists Terms and Conditions