Lymphatic cysts of the retroperitoneal space among the rarest abdominal tumors. A very small number, usually single case reports, has been reported in the international literature. Symptoms vary according to the tumor size but usually are minimal so that they are discovered by chance, either during an ordinary abdominal examination or because the patient complains of discomfort due to the pressure of the cyst on adjacent organs and tissues. Surgical intervention is the only treatment. Total cystectomy with the treatment of choice is seldom feasible, because of technical difficulty. A case of a huge retroperitoneal lymphatic cyst is reported. Epiploplasty with drainage is proposed as a new method of surgical treatment.