High frequency ultrasound probe sonography assisted EMR

What is high frequency ultrasound probe sonography assisted EMR? 

A high-frequency ultrasound probe uses a frequency of 20 or 30 mH, rather than 7.5- or 12-mH frequencies used in a conventional EUS transducer. The probe is introduced through the working channel of a standard therapeutic endoscope. The advantage of this probe is that it can be placed directly on a lesion with direct endoscopic guidance. This allows one to evaluate the depth of invasion of a mucosal lesion, whether in the esophagus, stomach, or colon, and determine whether it can be appropriately and safely removed by EMR after submucosal injection


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