Abstract
Endoscopic excision of large sessile polyps of the colon with an electrocautery snare has become an almost routine procedure. Despite the skill and experience of the endoscopist, it is frequently impossible to be certain that the entire lesion has been removed. The margins of the base of a polyp removed by electrocoagulation are edematous and irregular and contain varying amounts of coagulated tissue. In this setting, it is extremely difficult to determine with
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