Median Arcuate Ligament Syndrome (MALS)
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Overview
Median Arcuate Ligament Syndrome (MALS) is a rare condition in which the median arcuate ligament compresses the celiac artery and surrounding nerves. This compression reduces blood flow to the upper abdominal organs and irritates the celiac plexus, causing chronic abdominal pain, nausea, early satiety, and weight loss. MALS is often misdiagnosed, and proper evaluation requires specialized imaging and clinical expertise.
Causes
MALS is caused by an anatomical variation where the median arcuate ligament sits lower than normal, compressing the celiac artery. This leads to reduced blood flow and nerve irritation, especially during exhalation.
Risk Factors
Risk factors include anatomical variations, low body weight, female sex, and conditions that increase diaphragmatic movement. Many patients are young adults.
How MALS Affects the Body
Compression of the celiac artery reduces blood flow to the stomach, liver, and spleen. Irritation of the celiac plexus causes severe pain after eating, leading to reduced intake and weight loss.
Complications
Complications include chronic pain, malnutrition, weight loss, anxiety around eating, and reduced quality of life. Severe cases may lead to organ ischemia.
Symptoms & Signs
Symptoms include upper abdominal pain (often after meals), nausea, vomiting, early satiety, weight loss, bloating, and pain that worsens with exhalation or exercise.
Diagnosis
Diagnosis includes CT angiography, Doppler ultrasound showing respiratory variation, MR angiography, and evaluation by a vascular or foregut specialist. Other causes of abdominal pain must be ruled out.
Differential Diagnosis
Includes gallbladder disease, pancreatitis, gastritis, peptic ulcer disease, gastroparesis, SMA syndrome, and functional abdominal pain.
Lifestyle Modifications
Lifestyle changes may provide temporary relief but do not correct the underlying compression. Patients may benefit from small frequent meals and avoiding triggers.
Treatment Options
Treatment includes laparoscopic or robotic release of the median arcuate ligament, celiac ganglionectomy, and in some cases, vascular reconstruction. Most patients experience significant symptom improvement after decompression.
When to See a Doctor
Seek evaluation if you experience chronic upper abdominal pain, especially after meals, or unexplained weight loss.
When to Seek Treatment
Treatment is recommended when imaging confirms compression and symptoms interfere with eating, weight maintenance, or daily life.
Long-Term Outlook
Long‑term results are excellent for most patients, though some may require additional nerve‑related treatments or follow‑up imaging.
Prognosis
Most patients experience significant improvement after surgical decompression. Early diagnosis improves outcomes.
Why Choose Dr. de la Cruz‑Muñoz
Dr. Nestor de la Cruz‑Muñoz provides advanced minimally invasive surgical treatment for MALS, offering precise decompression, reduced pain, and faster recovery.
