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DOI: 10.1148/radiol.2362040984
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Comparison of US and Unenhanced Multi–Detector Row CT in Patients Suspected of having Acute Appendicitis1

Caroline Keyzer, MD, Marc Zalcman, MD, Viviane De Maertelaer, PhD, Emmanuel Coppens, MD, Maria-Antonietta Bali, MD, Pierre Alain Gevenois, MD, PhD and Daniel Van Gansbeke, MD

1 From the Department of Radiology, Hôpital Erasme, Université Libre de Bruxelles, Route de Lennik 808, B-1070-Brussels, Belgium (C.K., M.Z., E.C., M.A.B., P.A.G., D.V.G.); and Statistical Unit, Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Université Libre de Bruxelles, Brussels, Belgium (V.D.M.). Received June 7, 2004; revision requested August 16; revision received September 2; accepted November 11. Address correspondence to C.K. (e-mail: caroline.keyzer{at}chu-charleroi.be).



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  		Figure 1a. Images obtained in a 25-year-old man with a definite diagnosis of acute appendicitis. (a) Transverse and (b) coronal unenhanced CT reformations show an enlarged appendix (long arrow) and periappendiceal fat stranding (short arrow). US scans obtained in (c) short and (d) long axes show an enlarged appendix (long arrow) and hyperechoic periappendiceal tissue (short arrow).

 


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  		Figure 1b. Images obtained in a 25-year-old man with a definite diagnosis of acute appendicitis. (a) Transverse and (b) coronal unenhanced CT reformations show an enlarged appendix (long arrow) and periappendiceal fat stranding (short arrow). US scans obtained in (c) short and (d) long axes show an enlarged appendix (long arrow) and hyperechoic periappendiceal tissue (short arrow).

 


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  		Figure 1c. Images obtained in a 25-year-old man with a definite diagnosis of acute appendicitis. (a) Transverse and (b) coronal unenhanced CT reformations show an enlarged appendix (long arrow) and periappendiceal fat stranding (short arrow). US scans obtained in (c) short and (d) long axes show an enlarged appendix (long arrow) and hyperechoic periappendiceal tissue (short arrow).

 


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  		Figure 1d. Images obtained in a 25-year-old man with a definite diagnosis of acute appendicitis. (a) Transverse and (b) coronal unenhanced CT reformations show an enlarged appendix (long arrow) and periappendiceal fat stranding (short arrow). US scans obtained in (c) short and (d) long axes show an enlarged appendix (long arrow) and hyperechoic periappendiceal tissue (short arrow).

 


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  		Figure 2. Transverse oblique unenhanced CT reformation obtained in a 38-year-old man with a definite diagnosis of no acute appendicitis shows a normal appendix (arrow). The appendix was not seen at US.

 




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