Transoesophageal ultrasound is an imaging technique that uses an ultrasound probe inserted into the oesophagus to obtain detailed images of the heart and surrounding structures. It is crucial in clinical practice for diagnosing cardiac conditions such as valvular disease, endocarditis, and thrombi, especially when transthoracic ultrasound provides limited views. A key association is its role in detecting left atrial appendage thrombi before cardioversion in atrial fibrillation, reducing the risk of stroke.