What causes superior mesenteric artery syndrome?

The causes of superior mesenteric artery syndrome include congenital factors, postoperative adhesions, duodenitis, etc. The specific analysis is as follows:

1. Congenital factors

Because the angle between the abdominal aorta and superior mesenteric artery is too small in the fetal period, it is easy to cause duodenal obstruction, thus leading to superior mesenteric artery syndrome.

2. Postoperative adhesions

Because the patient has abdominal surgery, it is easy to cause intestinal adhesion, causing traction and compression to mesentery, resulting in superior mesenteric artery syndrome.

3. Duodenitis

Because duodenitis may stimulate local mesenteric lymph nodes, causing local lymph node enlargement, compressing duodenum, and also easy to cause superior mesenteric artery syndrome.