Abstract
A 32-year-old man consulted his primary care doctor for abdominal pain. Ultrasonography revealed a cyst near the tail of the pancreas, and he was referred to our hospital. Abdominal computed tomography revealed a cystic lesion measuring 45 × 38 mm on the caudal side of the ligament of Treitz. The margins were distinct, and no nodules were observed in association with the cyst. Magnetic resonance imaging revealed no connection between the lesion and the main pancreatic duct. Ultrasonography findings shifted easily with postural changes. Accordingly, a mesenteric cyst was diagnosed, and laparoscopic mesenteric cystectomy was performed. A 45-mm cystic tumor covered with mesentery was found at the jejunum. This was peeled from the mesenteric posterior lobe, and the cyst was completely removed. Pathologically, the cyst wall consisted of fibrous interstitium. As epithelial cells were not observed, a mesenteric pseudocyst was diagnosed. Mesenteric pseudocysts are rare, and this is the fifth reported case of laparoscopic resection in Japan. Treatment involves complete resection, and laparoscopic surgery is considered effective.
