Hidden in the Mesentery: Laparoscopic Removal of a Sigmoid Cyst

Abstract

Background: Mesenteric cysts are uncommon intra-abdominal lesions. Although they can occur anywhere along the mesentery, they are most frequently found in the small bowel mesentery. Sigmoid mesenteric cysts, as demonstrated in this case, are particularly rare. While these cysts are often asymptomatic, they may cause nonspecific symptoms such as bloating, abdominal pain, or an abdominal mass. If left untreated, complications such as infection, bleeding, volvulus, or intestinal obstruction may occur. Case Presentation: We present the case of a 45-year-old woman with a history of dull, progressive pain in the left hypochondrium for 1.5 years. Contrast-enhanced CT (CECT) of the abdomen revealed an 8 × 7.9 × 8.6 cm well-defined cystic lesion in the left lumbar mesentery, suggestive of a mesenteric cyst. The patient subsequently underwent laparoscopic excision of the cyst. Conclusion:  Laparoscopic excision is a safe, minimally invasive, and effective treatment option for mesenteric cysts, reducing postoperative morbidity and shortening hospital stay. This case highlights the importance of early detection, imaging-based diagnosis, and timely surgical intervention in preventing complications.