A 20 MHz ultrasound catheter (Olympus® UM-3R; Olympus® America Inc., Melville, NJ.) covered by a balloon sheath that may be inserted through the biopsy channel of the endoscope.
Courtesy of Enrique Vazquez-Sequeiros, MD and Maurits J Wiersema, MD.
Graphic 74641 Version 1.0
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