A case of chylous ascites due to retroperitoneal tumoral compression is reported. Following failure of a medical treatment which consisted of paracentesis and medium-chain triglyceride (MCT) diet, the ascites dried up after installation of a peritoneum-jugular vein shunt valve. This operation is seldom performed in patients with chylous ascites since the medical treatment with paracenteses, MCT diet or even total parenteral nutrition succeeds in drying the effusion in almost 50 percent of the cases, notably those with postoperative lesion.