A 39-year-old man was admitted to our hospital for aortic surgery for a remaining descending aortic dissected aneurysm. He previously underwent emergency total arch replacement for the treatment of ascending aortic dissection Stanford type A 5 years ago. Physical examination and laboratory data revealed no remarkable findings. Computed tomography (CT) detected a 70-mm-diameter descending aortic aneurysm. Descending aortic replacement was performed following posterolateral thoracotomy. Venoarterial bypass was established by femoral venous and arterial cannulation. Intraoperatively, the adhesion around the lung and aneurysm was not dense. The descending aortic replacement was carried out using a 28-mm-diameter woven graft. Surgery was completed uneventfully with no significant bleeding. One day postoperatively, hoarseness developed. A nasogastric tube was then inserted and enteral nutrition was initiated. Non-fat diet was given because the amount of pleural drainage was higher than the usual 300 mL/day, with a suspicion of chylothorax. Subsequently, the pleural drainage started to decrease. Thereafter, a fat-included diet was started on postoperative day 6, changing the pleural effusion to chyle. Chylothorax was confirmed by chemical analysis indicating triglyceride in the pleural drainage (1325 mg/dL) and blood (295 mg/dL). Oral intake cessation and total parenteral nutrition through a central venous catheter were started. As the factor XIII activity was 46%, factor XIII products were administered at 20 mL/day for 5 days. However, pleural effusion remained after these treatments. To specifically identify the location of and reduce the chyle leakage, lipiodol lymphography was attempted in the supine position through bilateral inguinal lymph nodes. A 23-G needle was inserted to the inguinal lymph nodes, followed by the injection of 7 mL of lipiodol in the right lymph node and 8 mL in the left lymph node (Fig. 1). Thirty minutes later, CT scan detected the location of the chyle leakage in the pleural cavity near the distal anastomosis (Fig. 2). Two days after this procedure, the amount of pleural effusion decreased. Following chest Chylothorax is a rare but serious complication of thoracic aortic surgery, leading to malnutrition, respiratory insufficiency, and prolonged hospital stay. In this article, we describe the successful treatment of a case of intractable chylothorax by lipiodol lymphography. The patient was a 39-year-old man who underwent descending aortic replacement for a remaining dissected aneurysm after total arch replacement. Chylothorax developed postoperatively. After complete oral intake cessation, total parenteral nutrition, and plasmatic factor XIII administration, lipiodol lymphography detected the chyle leakage location and subsequently decreased pleural effusion. The patient recovered uneventfully and was discharged on postoperative day 30 without any complications.