Superior Mesenteric Artery Syndrome

Superior Mesenteric Artery Syndrome is a rare condition that affects the digestive system, specifically the small intestine. It occurs when the superior mesenteric artery compresses the third part of the duodenum, causing a blockage. This compression leads to symptoms like abdominal pain, nausea, vomiting, and difficulty eating. The condition often results from significant weight loss or anatomical changes that reduce the fat cushion around the artery. Because the blockage interferes with normal digestion, it can cause discomfort and nutritional problems. Understanding this syndrome helps explain why some people experience persistent digestive symptoms after losing weight or surgery.

Superior Mesenteric Artery Syndrome (SMAS) is a rare vascular compression disorder characterized by external compression of the third portion of the duodenum between the superior mesenteric artery and the aorta. This occurs due to a decreased aortomesenteric angle, often caused by rapid weight loss, anatomical variants, or loss of the mesenteric fat pad. The resulting partial or complete duodenal obstruction leads to symptoms of postprandial abdominal pain, nausea, vomiting, and early satiety. SMAS is clinically significant because it can cause severe nutritional deficiencies and gastric distension if untreated. Diagnosis requires a high index of suspicion in patients with compatible symptoms and risk factors. The syndrome highlights the importance of vascular anatomy in gastrointestinal function.