superior mesenteric artery syndrome (Experimental Factor Ontology term EFO_1001201) is dUODENAL OBSTRUCTION by the superior mesenteric artery (MESENTERIC ARTERY, SUPERIOR) which travels in the root of the MESENTERY and crosses over the DUODENUM. The syndrome is characterized by the dilated proximal duodenum and STOMACH, bloating, ABDOMINAL CRAMPS, and VOMITING. Often it is observed in patient with body casts after spinal surgery. Also known as: Superior Mesenteric Artery Syndrome, Superior mesenteric artery syndrome, Superior mesenteric artery syndrome (disorder).