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Medically Reviewed By:

2026-05-01

  • Condition
  • Other
  • Severity: Routine

Median Arcuate Ligament Syndrome

Also Known As: MALS
Median arcuate ligament syndrome (MALS) is a vascular compression disorder in which the median arcuate ligament — a fibrous arch connecting the diaphragm’s two crura — compresses the celiac artery as it exits the aorta. This compression reduces blood flow to the stomach, liver, spleen, and intestines, causing a characteristic pattern of upper abdominal pain worsened by eating, audible abdominal bruits, weight loss, and nausea.


What Is the Median Arcuate Ligament?


The median arcuate ligament is a normal anatomical structure that forms the superior margin of the aortic hiatus in the diaphragm. In most people it sits well above the celiac artery takeoff. In patients with MALS, the ligament sits lower than normal, hooking over the celiac artery and compressing it — particularly during exhalation when the diaphragm descends.


MALS Symptoms

The classic MALS triad consists of post-prandial (after-eating) abdominal pain, significant unintentional weight loss (because patients avoid eating to prevent pain), and an audible abdominal bruit — a whooshing sound caused by turbulent flow through the compressed celiac artery. Symptoms are typically located in the epigastric region (upper-middle abdomen) and are often described as cramping, pressure, or a sharp ache that peaks 15–45 minutes after meals and subsides within one to two hours.

MALS Diagnosis

MALS is frequently misdiagnosed as irritable bowel syndrome, gastroparesis, or functional abdominal pain because the symptoms are nonspecific. Diagnosis requires a combination of clinical suspicion and targeted imaging. Duplex ultrasound can detect the characteristic elevated peak velocities in the celiac artery. CT angiography or MRI angiography provides anatomical detail and shows the “J-shaped” hook deformity of the compressed celiac artery. Catheter angiography performed in inspiration and expiration confirms dynamic compression.


MALS Treatment: Mesenteric Revascularization

Treatment of MALS involves surgical release of the median arcuate ligament — dividing the fibrous bands compressing the celiac artery — combined with celiac plexus ganglionectomy to address the neural component of the pain. Laparoscopic (minimally invasive) division is increasingly performed, offering faster recovery than open surgery. After ligament release, if the celiac artery remains narrowed due to post-stenotic changes, mesenteric revascularization — endovascular stenting or surgical reconstruction of the celiac artery — is performed to restore normal flow.

TOS Treatment: Arterial & Venous TOS Decompression

Vascular TOS (both arterial and venous) requires surgical decompression of the thoracic outlet, typically via first rib resection through a transaxillary or supraclavicular approach. Removing the first rib and releasing any fibromuscular bands relieves compression and eliminates the mechanical cause of the disease. Venous TOS may require additional venous stenting or venoplasty after decompression. Arterial TOS may require repair of arterial aneurysm or bypass of a diseased subclavian artery.

SYMPTOMS

  • Upper abdominal (epigastric) pain 15–45 minutes after meals
  • Significant unintentional weight loss from food avoidance
  • Audible abdominal bruit (whooshing sound)
  • Nausea or vomiting
  • Bloating or discomfort that peaks post-meal and resolves within 1–2 hours

DIAGNOSIS METHODS

  • Duplex Ultrasound (Celiac Artery) +

    Detects elevated peak velocities in the celiac artery during exhalation — a characteristic finding.

  • CT Angiography +

    Demonstrates the J-shaped hook deformity of the compressed celiac artery and rules out other causes.

  • MRI Angiography +

    Non-contrast alternative for young patients.

  • Catheter Angiography (Inspiration/Expiration) +

    Gold-standard — confirms dynamic compression pattern by imaging in both breathing phases.

TREATMENTS

RELATED CONDITIONS

FREQUENTLY ASKED QUESTIONS

  • How common is MALS? +

    MALS is a rare condition, estimated to affect approximately 1–2% of the population with celiac compression, though symptomatic disease requiring treatment is far less common. It is most prevalent in young, thin women between the ages of 20–40.

  • Is MALS dangerous? +

    Untreated MALS causes progressive malnutrition and weight loss from pain-avoidant eating behavior. In rare cases, severe celiac artery stenosis can lead to bowel ischemia. While not typically life-threatening in its early stages, MALS significantly impairs quality of life.

  • How soon after MALS surgery will I feel better? +

    Most patients experience improvement in pain and appetite within 2–6 weeks of surgery. Weight gain typically follows as food-related anxiety resolves. Full recovery varies from 2–4 months depending on the approach and extent of malnutrition at the time of surgery.