Respiratory Tract
An endoscopic ultrasound probe placed in the esophagus can also be used to visualize lymph nodes in the chest surrounding the airways (bronchi), which is important for the staging of lung cancer. Ultrasound can also be performed with an endoscopic probe inside the bronchi themselves, a technique known as endobronchial ultrasound.
Read more about this topic: Endoscopic Ultrasound
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—Calvin Coolidge (1872–1933)