MALS: Understanding, Diagnosing, and Treating a Rare Condition

Overview
Diagram of diaphragm and MALS condition comparison.

Median Arcuate Ligament Syndrome (MALS) is a rare but potentially debilitating condition caused by the compression of the celiac artery by the median arcuate ligament. This anatomical abnormality can restrict blood flow through the celiac artery to major abdominal organs, leading to symptoms that are often mistaken for other gastrointestinal disorders. Patients with MALS commonly experience epigastric pain, chronic abdominal pain, nausea, vomiting, and unintentional weight loss. Due to its rarity and overlapping symptoms with conditions like irritable bowel syndrome (IBS) and appendicitis, MALS can be challenging to diagnose. However, early detection and appropriate treatment can significantly improve the quality of life for those affected. In addition to his expertise in MALS, Dr. Tierney is also highly regarded as a superior mesenteric artery syndrome specialist.

Symptoms of MALS

MALS symptoms vary but often include sharp upper abdominal pain, especially after eating or exercising. Nausea, vomiting, and unintentional weight loss are common, as patients may eat less to avoid discomfort. Other possible symptoms include bloating, diarrhea, and fatigue, making diagnosis challenging since these overlap with other conditions. Commonly reported symptoms include:

  • Upper Abdominal Pain: Often described as a sharp or burning pain, especially after eating or exercising.
  • Nausea and Vomiting: These symptoms can occur frequently and may worsen after meals.
  • Unintentional Weight Loss: Many patients lose weight due to reduced food intake caused by pain and discomfort.
  • Other Symptoms: Some patients may also experience bloating, diarrhea, or fatigue.

Recognizing this spectrum of symptoms is crucial for early diagnosis and treatment. Since the severity and type of symptoms can vary widely, a comprehensive evaluation by a medical professional is essential to determine whether MALS is the underlying cause. Early intervention can help prevent further complications and provide relief from debilitating symptoms.

Diagnostic Process for MALS

Computed Tomography Angiography (CTA)

This is the most recommended imaging technique for detecting vascular compression and assessing the celiac artery's condition.

Doppler Ultrasound and Duplex Ultrasound

Provides real-time assessment of blood flow and can help visualize the artery and celiac axis compression.

Magnetic Resonance Angiography (MRA)

Often used for children or young adults to avoid exposure to ionizing radiation.

Angiogram

This procedure may be used if initial imaging tests are inconclusive, allowing for direct visualization of the blood vessels and confirming the presence of arterial compression.

Treatment Options for MALS

Conservative Management

Lifestyle changes include eating smaller, more frequent meals and avoiding foods that trigger symptoms. Gastric emptying tests may help establish the relationship between MALS and delayed gastric emptying. Medications may be prescribed to manage pain or other symptoms related to gastrointestinal function, such as those associated with gastrointestinal symptoms.

Minimally Invasive Surgery

Surgical intervention may be necessary if conservative treatments are ineffective. Laparoscopic surgery for MALS, such as the laparoscopic release of the median arcuate ligament, is a common approach. This minimally invasive procedure typically results in a shorter recovery time, less pain, and a lower risk of complications than traditional open surgery. Endovascular options may also be considered in some instances.

Multidisciplinary Approach

Effective management of MALS often involves a team of specialists, including gastroenterologists, vascular surgeons, and pain management experts, working together to provide comprehensive and personalized care. This collaborative approach is critical for the management of median arcuate ligament syndrome and the surgical treatment of MALS.

Causes and Risk Factors

Person clutching stomach in pain

The primary cause of MALS is the anatomical compression of the celiac artery by the median arcuate ligament. This fibrous band usually sits above the artery but can sometimes position itself lower than usual, pressing against the artery and surrounding nerves, such as the celiac plexus and celiac ganglion. Several factors can increase the risk of developing MALS, including:

  • Rapid Weight Loss: Loss of the protective fat pad surrounding the artery can increase the likelihood of compression.
  • Anatomical Variations: Individuals with specific anatomical configurations, like the median arcuate ligament muscle and fibers, are more prone to MALS.
  • Demographics: MALS most commonly affects women, particularly those between the ages of 20 and 40. Conditions like Dunbar Syndrome may also be associated with MALS.

At our clinic, Dr. Joshua Tierney brings his extensive expertise in minimally invasive and vascular surgery to the forefront of MALS treatment. With a patient-centered approach, Dr. Tierney specializes in advanced techniques like the laparoscopic release of the median arcuate ligament, providing effective relief for patients suffering from this rare condition. By combining innovative surgical methods with a compassionate understanding of each patient’s unique needs, Dr. Tierney and our team deliver comprehensive care to achieve the best possible outcomes. Dr. Joshua Tierney is recognized as one of the best MALS surgeons, offering advanced, minimally invasive techniques for MALS treatment.

Before surgery

Before undergoing surgery for MALS, the preoperative process generally involves the following steps:

  • Comprehensive evaluation, including medical history and imaging studies.
  • Discussion of surgery’s risks and benefits.
  • Dietary guidelines and medication adjustments leading up to surgery.
  • Preoperative instructions provided by Dr. Tierney.
  • Possible trial of lifestyle modifications or medications before surgery.

After surgery

The type of surgical procedure you undergo will determine the post-operative care required. Generally, post-surgery care involves:

  • Significant reduction in symptoms such as abdominal pain, nausea, and weight loss.
  • Quick recovery with most patients resuming activities within weeks.
  • Pain management, follow-up imaging, and dietary recommendations for healing.
  • Continuous support from Dr. Tierney’s team during recovery.
  • Favorable long-term outcomes with lasting symptom relief for many patients.

Frequently Asked Questions About MALS

MALS occurs when the median arcuate ligament, a fibrous band that normally arches above the coeliac artery, sits lower than usual and presses on that artery and the nerve fibres around it. The coeliac artery supplies blood to the stomach, liver and spleen. The compression is often most pronounced on breathing out. It is uncommon, and it most often affects women between roughly twenty and forty. Rapid weight loss can contribute by reducing the fat pad that normally cushions the area. Some degree of compression is present in many people without causing any symptoms at all, which is an important part of understanding the condition and of deciding who benefits from treatment.
The characteristic pattern is pain in the upper abdomen that comes on after eating or during exercise, often described as sharp or burning. Nausea, vomiting and weight loss are common, partly because people begin avoiding food to avoid the pain. Bloating, diarrhoea and fatigue also occur. The difficulty is that every one of these symptoms is shared with far commoner conditions, including irritable bowel syndrome, gallstones, gastritis and functional dyspepsia. As a result many patients are investigated for years and given other diagnoses before MALS is considered, and that delay is a genuine feature of the condition rather than an unusual failing.
There is no single test that confirms it. Diagnosis rests on combining imaging with the clinical picture and, importantly, on excluding other causes first. CT angiography is the usual starting point and shows the compression, often with a characteristic hooked appearance to the artery. Doppler ultrasound assesses blood flow and can be performed while breathing in and out, since the compression typically worsens on expiration. MR angiography is sometimes used, particularly in younger patients, to avoid radiation. A coeliac plexus nerve block that temporarily relieves the pain can support the diagnosis and is one of the more useful pointers to who will benefit from surgery. Because compression can be seen in people with no symptoms, imaging findings alone are never enough.
Where symptoms are mild, conservative measures come first: smaller and more frequent meals, avoiding trigger foods, and medication to manage pain or associated gut symptoms. When symptoms are significant and other causes have been excluded, the treatment is surgical release of the median arcuate ligament, dividing the fibrous band to take pressure off the artery and the surrounding nerve fibres. This is usually done laparoscopically or robotically through small incisions, which means less pain and a shorter recovery than open surgery. In a minority of patients the artery remains narrowed after release and a further endovascular procedure such as a stent is considered. Care is usually shared with gastroenterology and pain specialists.
For carefully selected patients it often helps, and some people get complete and lasting relief. It is important to be honest that the results are less predictable than for most operations, and that the published evidence reflects that. Most patients improve in the period immediately after surgery. Fewer sustain that improvement over the longer term, and symptoms can return without any change being visible on repeat imaging. Reported success rates across published series vary widely, broadly between six and nine in ten, which is a reflection of how differently patients are selected rather than of the operation itself. The factors that most favour a good result are the classic symptom pattern of pain after eating with weight loss, a clear response to a coeliac plexus block, younger age, and the thorough exclusion of other diagnoses. Patients with atypical symptoms tend to do less well. This is why assessment beforehand is deliberately careful, and why the operation follows the exclusion of other causes rather than preceding it.