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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Pale yellow stool suggests relative lack of bile pigments in the stool.
This is possible if gallbladder is not contracting well.
Hence a HIDA scan can be considered to assess gallbladder contractility.
This is not checked in Ct scan.
Liver problem is unlikely cause given normal enzymes.
However Autoimmune hepatitis is one possibility which also responds to prednisone.
Hence a liver specialist may be consulted with as well.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/