###Human: What does mild LA dilation in sonogrpahy indicate? ###Assistant: Hello. No major concern but it would be important to know why your left atrium is dilated. It may be because of higher blood pressure or problems with the heart valves or due to any heart muscle problem. I recommend you see a specialist as you might need some additional workup, perhaps a heart rhythm monitoring and or a stress test. High blood pressure, and valvular disease. Heart rhythm monitor.