Recent studies have demonstrated an increase in endo- scopic treatments for duodenal polyps. 1,2 However, endoscopic treatment for duodenal polyps is technically challenging because of the high risk of severe adverse events, such as perforation and bleeding. 3 Most of the cases reported to date deal with polyps located in the first and second parts of the duodenum; there are few reports of treatment for duodenal polyps at the superior duodenal angle (SDA). Endoscopic observation and resection of duodenal polyps at the SDA are extremely difficult because of the anatomical complexity and poor maneuverability of the endoscope. This article describes a case of a duodenal polyp at the SDA, in which it was difficult to even confirm the presence of a polyp without a hood. The polyp was successfully treated with cap- assisted endoscopic mucosal resection (EMRC).
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