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A 10-year-old Japanese Black cow showed icterus with gradual emaciation for a period of 3 months. Ultrasonography demonstrated increased “echogenicity” of the entire liver, with marked dilatation of the gall-bladder. At necropsy, the common bile duct was found to be obstructed by focally thickened fibrous tissue adjacent to a flesh-like mass (9×4×4 mm) attached to the wall of the duct. The mass consisted...
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