Median Arcuate Ligament Syndrome (MALS) Management

Diagnostic Criteria and Surgical Indications

• The American College of Radiology defines the diagnostic criteria for MALS, which includes imaging confirmation of celiac artery compression with expiration, clinical symptoms of chronic abdominal pain, and positive response to celiac plexus block 1, 3, 4
• Surgical release of the median arcuate ligament is medically indicated for patients with confirmed MALS, as it achieves 84.6% symptomatic relief 2, 4

Evidence Supporting Surgical Intervention

• The American College of Radiology 2022 guidelines support surgical management, with operative management producing 93% improvement compared to 33% improvement with conservative management 2, 3
• Long-term outcomes show 76% persistent symptom resolution when revascularization is performed in addition to decompression 2

Critical Procedural Considerations

• The procedure should include both ligament release and evaluation for need of revascularization, with celiac ganglion sympathectomy performed concurrently 1, 3, 4
• If residual celiac stenosis >30% persists after ligament release, additional revascularization (stenting or bypass) should be performed 1, 3, 4

Important Caveat About Endovascular-Only Approaches

• Endovascular stenting alone without surgical ligament release is contraindicated and will fail due to persistent extrinsic compression causing stent slippage, fracture, or migration 1, 3, 5

Addressing the Absence of Mesenteric Collateralization

• Patients without angiographic collateralization are more likely to benefit from surgical release than those with established collaterals 1, 3