Mesothelial-based cyst of the proximal jejunal mesentery: a rare cause of acute abdominal pain

Mesenteric cysts are rare benign intra-abdominal lesions, with mesothelial cysts representing an uncommon subtype. We present a 36-year-old female with acute abdominal pain and computed tomography scan with a large proximal jejunal mesenteric cyst. Surgical excision and en bloc resection were performed, and histopathology confirmed a benign mesothelial cyst. Postoperatively, the patient recovered uneventfully with improved glycaemic control, allowing discontinuation of antidiabetic therapy. This was considered an incidental finding.