Which distance between the abdominal aorta and the superior mesenteric artery should not exceed 11 millimeters?

Which distance between the abdominal aorta and the superior mesenteric artery should not exceed 11 millimeters?

• A. 5 mm
• B. 8 mm
• C. 11 mm
• D. 14 mm

Answer: (C)

The distance between the abdominal aorta and the superior mesenteric artery is measured to assess the likelihood of SMA compression of the duodenum. When this aortomesenteric distance narrows, SMA syndrome can result; when it remains wider, compression is unlikely. In practice, this distance is usually around 10–28 mm in adults, and SMA syndrome is associated with a notably reduced distance (often cited as a threshold in teaching materials around 8–11 mm). Among the given options, 11 mm is the value commonly used as the upper limit of what’s considered within the range where compression risk is evaluated. So 11 mm represents the cutoff that should not be exceeded in this context. The other distances reflect more pronounced narrowing or distances well outside that threshold: 5 mm and 8 mm indicate more significant narrowing and potential compression, while 14 mm is above the threshold and less concerning for SMA syndrome.

The distance between the abdominal aorta and the superior mesenteric artery is measured to assess the likelihood of SMA compression of the duodenum. When this aortomesenteric distance narrows, SMA syndrome can result; when it remains wider, compression is unlikely.

In practice, this distance is usually around 10–28 mm in adults, and SMA syndrome is associated with a notably reduced distance (often cited as a threshold in teaching materials around 8–11 mm). Among the given options, 11 mm is the value commonly used as the upper limit of what’s considered within the range where compression risk is evaluated. So 11 mm represents the cutoff that should not be exceeded in this context.

The other distances reflect more pronounced narrowing or distances well outside that threshold: 5 mm and 8 mm indicate more significant narrowing and potential compression, while 14 mm is above the threshold and less concerning for SMA syndrome.