WHAT IS A DIALATED LIVER DUCT?

I WAS TOLD I HAVE A DIALATED DUCT OF MY LIVER.  NOW I HAVE TO GO TO PEORIA IL TO HAVE A ENDOSCOPIC SONOGRAM DONE.  THIS IS AFTER A CT, A SONOGRAM, AND AN ENDOSCOP HAS BEEN DONE ALREADY.I AM REALLY WORRIED ALTHOUGH HE SAYS NOT TO BE.  MY SISTER DIED AT 42 FROM AUTO AMUNE  DIEASE OF THE LIVER AND NOW MY BROTHER HAS IT TOO. OK MAYBE IT ISNT MUCH FOR OTHER PEOPLE TO WORRY ABOUT BUT HEY IT IS FOR ME. MY DOCTOR SAYS HE WANTS TO FIND OUT WHATS GOING ON IF IT IS CAUSING ANY PROBLEMS OR GOING TO CAUSE PROBLEMS.  I HAVE HAD AN ILEOSTOMY DONE IN JUNE AND REVERSED IN AUGUST.  HAS ANY ONE ELSE HEARD OF THIS? I KNOW I FEEL HALF SICK ALOT BUT NOW YELLOWING.  WHATS GOING ON?