<unk><unk><unk>  <unk>  is a rare, life-threatening gastrointestinal disorder characterized by a compression of the third portion of the duodenum by the abdominal aorta and the overlying<unk><unk><unk> . The syndrome is typically caused by a decreased angle of 6°–25° between the aorta and the SMA (compared to a normal range of 38°-56°) due to a lack of retroperitoneal fat.<unk>  was first described in 1842 by Carl Freiherr von Rokitansky, currently estimated to impact only 0.013% of the American population.  Despite 400 cases reported in English-language medical literature, recognition of<unk>  as a distinct clinical entity is controversial,  with some in the medical community doubting its existence entirely. Wilkie published the first comprehensive series of 75 patients in 1927.<unk>  is also known as Wilkie's syndrome, cast syndrome,<unk>  root syndrome, chronic duodenal ileus and intermittent<unk> o-mesenteric occlusion.  
It is a distinct disease from Nutcracker syndrome, which is the entrapment of the left renal vein between the abdominal aorta and the SMA.
Superior mesenteric artery syndrome
Splenic artery aneurysm
Splenic infarction
Distal intestinal obstruction syndrome
Splenic vein thrombosis
Abdominal aortic aneurysm
Epiploic appendagitis
Ischemic colitis