Atrial enlargement is often used to describe a condition where the atria of the heart become larger than normal. There are several synonyms that can be used to describe this condition, including atrial dilation, atrial hypertrophy, and atrial dilatation. Other terms that may be used to describe this condition include left atrial enlargement, right atrial enlargement, or bi-atrial enlargement, depending on which chamber or chambers are affected. Additional terms that may be used to describe related conditions include atrial fibrillation, atrial flutter, and congestive heart failure. Regardless of the term used, atrial enlargement is a serious medical condition that requires prompt treatment and careful management.