Heterogeneous liver

Hello,

I have had an ultrasound and a ct scan which both tell me that I have possible biliar cysts on my liver, the ct scan report actually says that they are hypodense nodules in relation to biliar cysts with a simple content.  The liver is heterogeneous whereas it was homogeneous six months ago.  Is it the cysts that are giving it the heterogeneous appearance? or is it something else?  The doctors say that there is nothing wrong, but I cannot rest until I know exactly what it is.  Please help!