Contributing Factors
Weight Loss
Loss of mesenteric fat may reduce cushioning around the vessels and decrease the space available for the duodenum.
Surgery or Trauma
Some cases are reported after surgical procedures, trauma, or significant medical events.
Reduced Nutritional Intake
Difficulty maintaining adequate intake or poor nutrition may contribute in some individuals.
Rapid Growth/Body Changes
Growth spurts and body composition changes have been discussed in the literature.
Low Body Weight
Reduced body mass or low body fat stores may influence the aortomesenteric angle and distance.
Anatomical Variation
Individual anatomical differences may affect the aortomesenteric angle or distance.
Prolonged Illness
Extended illness, bed rest, or reduced mobility have been associated in some reports.
Associated Conditions
Some patients report additional gastrointestinal, connective tissue, or vascular conditions
SMAS does not have one known cause. Multiple anatomical, nutritional, surgical and medical factors may contribute to narrowing between the superior mesenteric artery and aorta. Experiences vary from person to person.
