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Cystic lymphangioma of the greater omentum treated by laparoscopic resection. We report a rare case of cystic lymphangioma of the greater omentum, which was treated by laparoscopic resection. A 61-year-old man was referred to our hospital for the treatment of a perigastric cystic lesion. Esophagogastroduodenoscopy revealed neither a mucosal lesion nor a submucosal tumor in the stomach. Abdominal contrast-enhanced computed tomography imaging showed a cystic lesion in the ventral side of the lower part of the stomach and no mass lesions in the liver. The patient underwent laparoscopic resection of the cystic lesion. The intraoperative observation confirmed that a well-defined cystic lesion was present wrapped in the greater omentum and located predominantly in the right side. Although the cystic lesion was located directly beside the right gastroepiploic artery and vein, excision of the cystic lesion along with the cuff of the omentum was performed without sacrificing the vessels. Macroscopic examination of the resected specimen showed an ovoid, cystic mass measuring 7.5 × 4.3 cm within the omentum. The pathological diagnosis was "cystic lymphangioma without malignant signs." Following surgery, the patient remained symptom-free without evidence of recurrence for 6 months. The laparoscopic approach, being minimally invasive, can be considered the most feasible approach for the resection of an abdominal cystic lymphangioma.