Abstract
Cystic lymphangiomas are uncommon benign lesions extremely rare in the adult population. Most cases are found in the neck and axillary regions; while <1% of patients present with cystic lymphangiomas in the mesentery, greater omentum and retroperitoneum. The present report describes a rare case of large omental lymphangioma mimicking ovarian mass. A 40-year-old G2P2 female patient presented without symptoms for routine gynecological examination. Transvaginal ultrasound examination revealed a cystic mass with a maximum diameter of 10 cm localized at the right parametrium space, suggestive of large cystic lesion of the right ovary. Further preoperative evaluation by magnetic resonance imaging indicated that the mass was either cystic lymphangioma or mesenteric cyst. Complete excision of the cyst without need for gastrectomy was performed via laparotomy under general anaesthesia. Histology revealed omental lymphangioma. Most abdominal lymphangiomas are initially asymptomatic. The role of synchronous imaging examinations, such as ultrasonography and magnetic resonance imaging, in diagnosis of these lesions is crucial. Full preoperative differential diagnosis evaluation in cases of large intraabdominal lesions is required in order to decide the appropriate surgical approach and management.