Median Arcuate Ligament Syndrome (MALS): Symptoms and Diagnosis in the UK

Median Arcuate Ligament Syndrome (MALS), also known as Dunbar syndrome or celiac artery compression syndrome, is a relatively rare digestive condition. It occurs when the median arcuate ligament—a wedge-shaped arch of fibrous tissue that connects the diaphragm to the spine—sits lower than usual. In this position, it can press against the celiac artery (which supplies blood to the upper abdominal organs) and the celiac plexus (a network of nerves).

This compression can lead to chronic, often debilitating abdominal pain. While the exact reason why some people develop symptoms and others do not is still being researched, it is believed that both the restriction of blood flow and the irritation of the nerves play a significant role. Because the symptoms mimic more common gastrointestinal disorders, many patients in the UK undergo extensive testing for years before receiving an accurate diagnosis.

The symptoms of MALS are often triggered by eating, leading many patients to develop a fear of food ('food fear'). This can result in significant unintended weight loss. Typical symptoms reported by UK patients include:

• Postprandial pain: Sharp or cramping pain in the upper middle abdomen (epigastric region) that starts 10 to 30 minutes after eating.
• Nausea and vomiting: Often accompanying the pain episodes.
• Bloating: A feeling of excessive fullness even after small meals.
• Weight loss: Due to decreased caloric intake as a result of pain associated with eating.
• Abdominal bruit: A specific sound heard by a doctor through a stethoscope, caused by turbulent blood flow in the narrowed celiac artery.

In the UK, many patients are initially diagnosed with Irritable Bowel Syndrome (IBS) or Gastritis because the pain is localized to the upper abdomen. However, MALS pain is typically more consistent and severe than common functional gut disorders.

Diagnosing MALS is a process of exclusion. Your GP will first want to rule out more common conditions such as gallstones, peptic ulcers, or inflammatory bowel disease (IBD). According to NICE clinical knowledge summaries for abdominal pain, initial investigations usually include blood tests (liver function, full blood count, CRP) and perhaps a referral for a gastric endoscopy.

If these tests returned normal results but the pain persists particularly after meals, more specialised imaging is required. The primary methods for identifying MALS in a UK clinical setting include:

• Mesenteric Doppler Ultrasound: This looks at the velocity of blood flow in the celiac artery during breathing in and out.
• CT Angiography (CTA) or MR Angiography (MRA): These provide detailed 3D images of the blood vessels to show the 'hook-shaped' narrowing characteristic of MALS.
• Gastric Exercise Testing: Sometimes used to see how blood flow changes when the digestive system is under stress.

If you are suffering from persistent upper abdominal pain that has not responded to over-the-counter antacids or dietary changes, speaking to a GP is the essential next step. An online doctor in the UK can be an excellent resource for an initial assessment, especially if you are finding it difficult to secure a face-to-face appointment.

During a consultation, you can discuss your symptom history, the timing of your pain, and any weight loss you have experienced. While an online GP cannot perform the physical examination required to hear a bruit, they can review your previous test results, suggest specific imaging tests to your local NHS trust, and provide sick notes if your symptoms are preventing you from working. They can help bridge the gap between initial symptoms and a specialist referral to a vascular surgeon or gastroenterologist.

The definitive treatment for MALS is surgical. The procedure is known as a Median Arcuate Ligament Release. In the UK, this is increasingly performed using laparoscopic (keyhole) or robotic-assisted surgery, which reduces recovery time compared to open surgery.

The surgeon cuts the ligament to release the pressure on the celiac artery and may also perform a 'coeliac plexectomy'—the removal of the irritated nerve fibres in the area. Most patients report a significant reduction in pain almost immediately after surgery, allowing them to return to a normal diet. For some, if the artery remains narrowed after the ligament is cut, a vascular specialist may recommend an angioplasty or stent, though this is less common.

Self-Care and Dietary Adjustments

While waiting for a specialist diagnosis, some patients find comfort in eating smaller, more frequent meals (grazing) rather than three large meals, as this places less demand on the blood supply to the gut. Avoiding high-fat foods that take longer to digest may also help manage the intensity of postprandial episodes.