Us of gallbladder showed lower right lobe of liver grossly normal ct scan showed mild diffuse fatty liver test where 3wks apart how could it?

Ct more sensitive : Ct is more sensitive then u/s and u/s demands on who does it then ct which is a machine.

Different techniques: A gallbladder us is focussed on the gallbladder, not the liver. Mild fatty liver may not be easily appreciated on us depending on the patient size and acoustic conditions. A non contrast ct allows for measurement of the actual density of the liver and compare it to the spleen to better quantify the liver fat. Also, what one radiologist feels is within normal may be mildly fatty to another.