Median arcuate ligament syndrome is one of the lesser-known causes of abdominal pain that appears with eating. It often causes no problems at all and is discovered by chance, but in some people it can end up affecting daily life.
What median arcuate ligament syndrome is
It is compression of the celiac trunk — one of the main arteries supplying the abdomen — by the arcuate ligament of the diaphragm, a band of tissue that in some people sits too low and presses on the artery.
One point is worth being clear about: in many people this compression exists without causing any symptoms and is seen as an incidental finding on an imaging test. It is only considered a syndrome when it causes discomfort.
Symptoms
When it does cause symptoms, the most characteristic are:
- Abdominal pain after meals, in the upper abdomen.
- Nausea and, sometimes, a feeling of fullness.
- Weight loss, partly from eating less to avoid the pain.
Because these symptoms are common to many digestive problems, this syndrome is diagnosed by exclusion.
What matters here is the order: the common causes of abdominal pain are ruled out first. When no other explanation appears and the imaging shows the compression, it makes sense to consider treatment.
How it is diagnosed
Diagnosis combines the clinical picture with imaging tests. Doppler ultrasound can show how the artery's flow changes with breathing, and CT angiography confirms the compression of the celiac trunk. But, above all, it is essential to rule out other causes of abdominal pain before attributing it to this syndrome.
Treatment
Asymptomatic cases are not treated. When the condition is symptomatic and other causes have been ruled out, the gold standard is to surgically release the ligament compressing the artery, today often using minimally invasive techniques. The indication is assessed on an individual basis. In some cases, endovascular treatment with stent placement is an option. You can find more context on the page about vascular compressive syndromes.
In summary
Median arcuate ligament syndrome is compression of the celiac trunk by a band of the diaphragm. Most of the time it causes no symptoms; when it does, it produces abdominal pain after eating and weight loss, and it is diagnosed by ruling out other causes. If you have this pattern of unexplained pain, a vascular assessment can provide the missing piece.