This feasibility trial will evaluate the ability of the SuMO Tissue Access and Resection
System (Apollo Endosurgery, Austin, Texas). The SuMO System utilizes balloons to create a
submucosal pocket and electrosurgical cutting device to resect the mucosa. The SuMO elevates
the tissue from the underlying muscularis using a balloon to distend the submucosa, similar
to what is currently performed with injectable saline in a standard EMR. After dissection of
the lesion, a separate cutting device will be utilized to resect the tissue by cutting around
the border of the targeted tissue. If needed, a standard loop snare will be used to complete
the mucosal resection.