LAUSR

A 21-year-old woman was referred to our hospital for management of a large duodenal duplication cyst. In the preceding 3 months, she had experienced symptoms of bloating, early satiety, and abdominal discomfort. The cyst was first diagnosed 5 years earlier during investigation for her ileal Crohn’s disease, but was not referred because she was asymptomatic at the time. Magnetic resonance enterography showed a large cystic lesion in the descending duodenum, consistent with a duplication cyst (Fig. 1A). EUS revealed an anechoic submucosal lesion in the descending duodenum, arising from layer 2, and it appeared to have its own muscularis propria layer (Fig. 1B). Duodenoscopy revealed a 3-cm-wide, 6-cm-long cyst on the anterolateral wall of the descending duodenum (Fig. 1C). The major papilla was seen on the inferomedial aspect of the cyst.