About Median Arcuate Ligament Syndrome (MALS)
Median arcuate ligament syndrome (MALS), also known as Dunbar syndrome, is a rare condition where a band of tissue called the median arcuate ligament compresses the celiac artery, which supplies blood to the stomach, liver, and other organs. Normally, this ligament sits above the artery, but in some people, it crosses over it, leading to a significant narrowing or blockage. This can cause symptoms like stomach pain after eating, weight loss, and an abnormal sound in the abdomen, known as an abdominal bruit. However, some people with MALS may not have any symptoms at all.
Diagnosis of MALS can be challenging because the symptoms can be vague and resemble other conditions. Treatment often involves surgery to release the ligament, and in some cases, laparoscopic surgery may be used. It is important to consult with a healthcare professional for an accurate diagnosis and appropriate management.
The underlying cause of median arcuate ligament syndrome (MALS) is the compression of the celiac artery by the median arcuate ligament (MAL), which causes the artery to narrow and reduces blood flow to the organs in the abdomen.
To compensate, blood is rerouted through other arteries, like the superior mesenteric artery and the pancreaticoduodenal arteries. Over time, this increased blood flow through these alternative routes can lead to the formation of true aneurysms (balloon-like bulges in the blood vessels), which carry the risk of rupturing.
Non-modifiable risk factors for MALS, which are factors that cannot be controlled to reduce the risk of developing the condition, include:
- Congenital and genetic factors: Some cases of MALS are believed to have been present from birth
- Age and gender: MALS is more commonly diagnosed in women between the ages of 30 and 50.
Modifiable risk factors for MALS, which are factors that usually can be controlled to reduce the risk of developing the condition, are not well-established in the literature. However, it is important to note that MALS can occur following surgery, although these cases are less common.
It's essential to consult with a healthcare professional for an accurate diagnosis and appropriate management of MALS. They can provide personalized advice based on your specific situation.
The most common early symptoms of median arcuate ligaments syndrome (MALS) include:
- Pain that occurs after eating, particularly in the upper abdomen
- Unintentional weight loss
As MALS progresses or becomes more severe, the following additional symptoms may occur:
- Abdominal bruit: An abnormal sound heard over the abdomen due to compression of the celiac artery by the median arcuate ligament.
- Nausea and vomiting: These symptoms may accompany abdominal pain.
- Epigastric pain: Pain in the upper middle abdomen.
- True aneurysm formation: High-flow aneurysms can develop in the arteries around the pancreas and the first part of the small intestine due to decreased flow in the main artery that supplies blood to the abdomen.
It is important to note that these symptoms are not special to MALS and can be caused by various other conditions as well. If you are experiencing any of these symptoms, it is recommended to consult with a healthcare professional for an accurate diagnosis and appropriate management.
To diagnose median arcuate ligament syndrome (MALS), several examinations, tests, and procedures are commonly performed:
- Medical history: The healthcare provider will review your symptoms and medical history to assess the possibility of MALS.
- Physical examination: A physical examination may be conducted to check for any signs of abdominal tenderness or abnormal blood flow.
- Imaging tests: Various imaging tests can help in diagnosing MALS, including:
- Computed tomography angiography (CTA): This test uses contrast dye and CT scan to visualize the blood vessels and detect any narrowing or compression.
- Doppler ultrasonography: It measures blood flow in the affected arteries and can show changes in blood flow when a person breathes in and out.
- Magnetic resonance angiography (MRA): It uses magnetic fields and radio waves to create detailed images of blood vessels.
Additional examinations, tests, and procedures to determine the stage or severity of MALS may include:
- Vascular surgery consultation: A consultation with a vascular surgeon may be needed to assess the need for surgery.
- Angiography: This invasive procedure involves injecting a contrast dye into the blood vessels to obtain detailed images. It can help determine how severe the artery compression.
- Hemodynamic studies: These tests measure blood flow and pressure within the affected arteries to evaluate the impact of compression on blood circulation.
Remember, these are general examinations, tests, and procedures used for diagnosing and determining the severity of MALS. Your healthcare provider will determine which specific tests are necessary based on your individual case.
The goals of treatment for median arcuate ligament syndrome (MALS) are to relieve symptoms and improve blood flow to the affected area. Here are the different treatment options and how they work to achieve these goals:
- Medication:
- Pain medications: These can help manage abdominal pain associated with MALS. However, they do not address the underlying cause and should be used under medical supervision.
- Therapies:
- Cognitive-behavioral therapy (CBT): This therapy can help patients cope with chronic pain and improve their overall quality of life.
- Therapeutic procedures:
- Open release of the median arcuate ligament: This surgical procedure involves cutting the ligament that is compressing the celiac artery, thus improving blood flow
- Laparoscopic release of the median arcuate ligament: Similar to open release, but is done through smaller incisions using a thin tube with a camera (laparoscope)
- Robot-assisted release of the median arcuate ligament: A minimally invasive procedure that uses robotic technology to perform precise movements during the release of the ligament
- Health behavior changes:
- Dietary modifications: Some individuals find symptom relief by avoiding trigger foods or following a specific diet plan recommended by their healthcare provider.
- Stress management: Practicing stress-reducing techniques such as meditation, yoga, or deep breathing exercises may help alleviate symptoms.
It's important to note that the choice of treatment depends on individual factors and should be discussed with a healthcare professional. They can provide personalized recommendations based on your specific situation.
Medication dosing may be affected by many factors, so it's crucial to consult your healthcare professional for appropriate dosing instructions. Other side effects can occur, so it's essential to discuss potential risks with your healthcare professional or refer to the medication information provided.