Abstract
A 50-year-old woman, with a retroperitoneal cyst discovered by a medical checkup, visited our hospital. Abdominal computed tomography showed a large multilocular cystic mass which located on the left side of the abdomen. MRI was performed but a definitive diagnosis was not made. At laparotomy, a giant cystic tumor with a smooth surface was located in the small bowel mesentery. It adhered to the jejunum 10 cm from the Treitz ligament, but it was completely resected. It contained chylous fluid. Pathological examination of the surgical specimen revealed endothelial cells on its internal wall. The final diagnosis was cystic lymphangioma. The postoperative course was uneventful, and no evidence of recurrence has been seen in the 1 year after surgery. Although mesenteric lymphangioma is rare, it should be taken into consideration in the differential diagnosis of abdominal cystic tumor.
