A transesophageal echocardiogram (TEE) is a special echocardiogram that takes ultrasound images of your heart from inside your esophagus (swallowing or food tube).
If you have a TEE, you will swallow a flexible tube (the size of an index finger) that has a small ultrasound transducer on the end. Once you have swallowed the tube, the doctor will take close-up ultrasound pictures of your heart.