It means that you may have a fatty liver condition, common now days, but it is focal, maybe. The reason for concern is anything focal and lpcaled in the portal hepatic region needs to be properly identified. The region is a very critical location of the liver, lots of stuff going on wrt portal vein and bile ducts. You will likely need to get an MRO done just to be sure. MRI's are the best way to identify any focal etiologies.