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ULTRASONOGRAPHIC FEATURES OF EXTRAHEPATIC BILIARY OBSTRUCTION IN 30 CATS

Authors

  • HUGUES A. GAILLOT,

    1. Imagerie Médicale Vétérinaire IMV15, 10, 12 rue Robert de Flers, 75015 Paris, France,
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  • DOMINIQUE G. PENNINCK,

    1. Department of Clinical Sciences, Foster Hospital for Small Animals, Tufts University Cummings School of Veterinary Medicine, 200 Westboro Road, North Grafton, MA
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  • CYNTHIA R. L. WEBSTER,

    1. Department of Clinical Sciences, Foster Hospital for Small Animals, Tufts University Cummings School of Veterinary Medicine, 200 Westboro Road, North Grafton, MA
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  • SYBIL CRAWFORD

    1. Epidemiology and Biostatistics Unit, Division of Preventive and Behavioral Medicine, University of Massachusetts Medical School, 55 Lake Avenue North, Shaw Building, Worcester, MA.
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Address correspondence and reprint requests to Hugues A. Gaillot, Imagerie Médicale Vétérinaire XV, Paris, France. E-mail: hgaillot@yahoo.fr

Abstract

The goals of our study were to review the ultrasonographic features of spontaneous extrahepatic biliary obstruction in cats and to determine whether these features can assist in differentiating tumor, inflammation, and choleliths as the cause of obstruction. Thirty cats with a presurgical ultrasound examination and confirmed extrahepatic biliary obstruction were studied. A common bile duct diameter over 5 mm was present in 97% of the cats with extrahepatic biliary obstruction. Gallbladder dilation was seen in <50% of the cats. Ultrasound identified all obstructive choleliths (calculus or plugs) in the common bile duct. However, neither common bile duct diameter nor appearance or any other ultrasonographic feature allowed differentiation between tumor and inflammation as the cause of obstruction. A short duration of clinical signs (10 days or less) seemed to be associated with obstructive cholelithiasis.

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