A case report of spontaneous dissection of the superior mesenteric artery (SMA) in a 53-year-old man who complained of sudden colic-midabdominal pain is presented. In this case, ultrasonography is very usefull for early diagnosis of dissection, and this is successfully treated by Ao-AMS bypass with excision of the proximal segment of SMA. Postoperatively the patient has no symptoms for 2 years.

Two cases of abdominal lymphatic disruption following surgery on the abdominal aorta are presented, one causing para-aortic lymphocyst and the other resulting in chylous ascites. The 1st patient ultimatery received operative drainage into the lymphocyst. The 2nd patient responded to twice paracentesis and total parenteral nutrition for one month. We need to be aware of these complications and pay attention to prevention and early diagnosis.