Laparoscopic Excision of a Mesenteric Pseudocyst—A Case Report—

Abstract

A 55-year-old woman underwent laparoscopy-assisted ileocecal resection for ascending colon cancer, 3 years prior to presentation. Preoperative computed tomography (CT) revealed a mass (25 mm) in close proximity to the ligament of Treitz. CT performed 2 years and 6 months later revealed a slight increase in the lesion size. We suspected a small gastrointestinal stromal tumor and performed laparoscopic tumor resection. Intraoperatively, we observed a white mass on the ventral aspect of the upper jejunal mesentery immediately beyond the ligament of Treitz. The mass was not continuous with the small intestine, and the tumor was considered to have originated from the mesentery. The peritumoral serosa was incised ; only the nutrient arteries from the mesentery were treated, and the tumor was resected laparoscopically. Histopathological evaluation of the resected specimen confirmed diagnosis of a mesenteric pseudocyst. A search for “mesenteric pseudocyst” in Ichushi-web yielded 27 previous cases of mesenteric pseudocysts, with laparoscopic resection performed in six cases. Few reports have described laparoscopic mesenteric pseudocyst resection in Japan. We report the first case of a mesenteric pseudocyst that we encountered in our practice, along with a brief literature review.