Hi everyone! My dad was just recently diagnosed with colon cancer. He just had a small tumor removed from his upper right colon, surgery went really well and he is home now doing great. He also has mets to the liver. He will start chemo in 4 to 6 weeks to kill any lingering cells and he is going to have RFA done on the masses in his liver. My question: I was reading over his reports and about the masses, it states in his report that they are " low density" and "undefinable" , what exactly does that mean, if anyone knows. I mean I know it is cancer that has mets from his colon and that there are several lessions, just not sure exactly what the "undefinable" and "low density" mean. I am just one of those type of people that has to understand everything, lol! Thanks in advance!