Abstract
Extragonadal teratoma originating from the mesentery is extremely rare. A 45-year-old man was found in computed tomography and ultrasonography to have a round, well-encapsulated cystic mass with partial calci-fication in the right abdomen. Serum CEA was 138ng/ml and serum CA19-9 53U/ml, suggesting potential malignancy. At laparotomy, the 9×5cm tumor was located in the mesentery of the ileocecal region. Because it was well encapsulated, we excised the tumor without bowel resection. The histopathological diagnosis of be-nign mature mesenteric teratoma was made postoperatively. Serum CEA and CA19-9 normalized within 2 months of surgery. This is, to our knowledge, the first reported case of mesenteric teratoma with high serum CEA and CA19-9. To diagnose mesenteric tumors, benign mesenteric teratoma should be considered. Be-cause tumor resection is appropriate surgical management for mesenteric teratoma, bowel resection should be avoided to minimize surgical stress.
