An endoscope is inserted through the mouth and into the esophagus, stomach, and duodenum.

A thin, lighted tube is inserted through the mouth to look for abnormal areas in the esophagus, stomach, and first part of the small intestine.

A feeding tube inserted through the mouth or gastrostomy may be necessary if swallowing is impaired.

A thin, lighted tube is inserted through the mouth and into the esophagus to look for abnormal areas.

A bronchoscope is inserted through the mouth, trachea, and major bronchi into the lung, to look for abnormal areas.

In a transesophageal echocardiogram, a transducer is inserted through the mouth and down the throat into the esophagus.

The bronchoscope is inserted through the mouth or nose and down the windpipe.

This instrument is inserted through the mouth and down the throat into the esophagus to monitor the heart.

An esophagoscope is inserted through the mouth or nose and down the throat into the esophagus.