Dilated cardiomyopathy is a condition where the heart becomes enlarged and doesn't pump blood as well as it should. From what you shared, it looks like the left atrium and right atrium of the heart are both a bit bigger than usual. That can sometimes be a sign that there might be a problem, but it doesn’t necessarily mean someone has dilated cardiomyopathy.
If doctors are looking at these findings, they might want to do more tests or check for other symptoms to see if everything is okay. It’s important to talk to a doctor about what these findings mean and if any treatment is needed.