Part 7/Chapter 45/4-min read

Thoracic Outlet Syndromes: Neurogenic, Venous, and Arterial

Thoracic outlet syndrome requires careful classification. Neurogenic, venous, and arterial TOS share the scalene, costoclavicular, and pectoralis minor spaces, but they differ in diagnostic certainty, urgency, imaging, treatment sequence, and outcome measure. Neurogenic TOS requires a multi-criterion clinical diagnosis with active exclusion of mimics; venous TOS is an acute effort-thrombosis pathway built around anticoagulation, selected thrombolysis, decompression, and follow-up; arterial TOS is uncommon but dangerous when embolisation, aneurysm, thrombosis, or limb ischemia is present.

Edited by Tal M. Hörer MD, PhD · David T. McGreevy MD, PhD·Reviewed ·4 sections · 11 references

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Definition and presentation

Thoracic outlet syndrome comprises three distinct conditions caused by compression of the brachial plexus, subclavian vein, or subclavian artery within the scalene triangle, costoclavicular space, or pectoralis minor region .

Neurogenic thoracic outlet syndrome is the most common variant. It presents with activity-related pain, paraesthesia, heaviness, fatigability, weakness, or loss of overhead tolerance. Symptoms localize to the neck, shoulder girdle, chest wall, arm, forearm, or hand .

Venous thoracic outlet syndrome, or Paget-Schroetter syndrome, presents as effort thrombosis of the axillosubclavian vein. It typically occurs in young or active patients following strenuous or repetitive upper-limb use, resulting in sudden arm swelling, cyanosis, heaviness, and venous collaterals .

Arterial thoracic outlet syndrome is uncommon but limb-threatening. It is usually associated with a cervical rib or congenital bony anomaly causing repetitive subclavian-artery trauma. Presentations include exertional arm ischemia, acute upper-limb ischemia, digital embolisation, subclavian-artery stenosis, post-stenotic dilatation, aneurysm, or mural thrombus .

Diagnosis and imaging

Neurogenic diagnosis requires a multi-criterion framework grading the condition as probable or definite. Criteria include compatible symptoms, consistent physical examination findings, functional limitation, active exclusion of mimics, and a targeted response to a scalene block . Diagnostic mimics that must be excluded include:

  • Cervical radiculopathy, particularly C7 or C8 disease.
  • Ulnar nerve entrapment at the elbow.
  • Rotator-cuff disease, adhesive capsulitis, and scapulothoracic dysfunction.
  • Complex regional pain syndrome and fibromyalgia .

Imaging modalities are selected according to the suspected variant . For neurogenic disease, cervical-spine and thoracic outlet plain radiography identifies cervical ribs or anomalous anatomy. MRI of the cervical spine evaluates radiculopathy, and MRI of the brachial plexus evaluates plexopathy or mass. For venous disease, dynamic duplex ultrasound evaluates for acute thrombus and positional compression, while catheter venography provides treatment planning. For arterial disease, CTA or MRA with provocative positioning demonstrates compression, stenosis, aneurysm, thrombus, distal embolic sources, and bony relationships .

Treatment pathways

Management is dictated by the specific variant and ranges from conservative rehabilitation to urgent surgical reconstruction.

Management pathways by thoracic outlet syndrome variant

  • Probable NTOS

    Subtype or clinical focus
    Functional limitation, no vascular compromise
    Preferred action
    Rehabilitation, posture optimization, and longitudinal reassessment
    Citation

  • Definite NTOS

    Subtype or clinical focus
    Failed structured conservative care, severe limitation
    Preferred action
    Surgical decompression planning
    Citation

  • Acute VTOS

    Subtype or clinical focus
    Axillosubclavian effort thrombosis
    Preferred action
    Staged pathway: anticoagulation, thrombolysis, decompression, and venography
    Citation

  • ATOS

    Subtype or clinical focus
    Embolisation, aneurysm, or ischemia
    Preferred action
    Urgent vascular evaluation, arterial repair, and substrate decompression
    Citation

Management of acute venous thoracic outlet syndrome follows an ordered staged pathway:

  1. Therapeutic anticoagulation is initiated immediately to prevent thrombus propagation and embolisation.
  2. Catheter-directed thrombolysis is deployed in suitable candidates. Benefit is highest when performed within approximately 14 days of symptom onset.
  3. First-rib resection and soft-tissue division are performed to decompress the costoclavicular space and remove the mechanical substrate.
  4. Surveillance venography and symptom-based follow-up assess venous patency and guide further intervention .

Arterial thoracic outlet syndrome operates on an urgent surgical timeline. Digital embolisation, a subclavian-artery aneurysm with mural thrombus, or acute ischemia demand immediate intervention. Arterial repair, using interposition grafting or bypass, is paired with decompression of the compressive anatomy .

Areas of controversy

The surgical-benefit boundary for neurogenic thoracic outlet syndrome remains undefined. Randomized comparative evidence is lacking, and outcomes depend heavily on diagnostic discipline, mimic exclusion, structured rehabilitation, and center experience rather than the operative intervention alone . The optimal surgical approach for decompression is not uniformly established. Supraclavicular, transaxillary, paraclavicular, and robotic approaches are selected based on the disease variant, local anatomy, and specific team competence rather than a single superior technique .

References

  1. 1.
    Reporting standards of the Society for Vascular Surgery for thoracic outlet syndrome. 2016.
    DOI publisher route2016

    Reporting standards of the Society for Vascular Surgery for thoracic outlet syndrome. 2016. doi:10.1016/j.jvs.2016.04.039.

    DOI
  2. 2.
    ACR Appropriateness Criteria Thoracic Outlet Syndrome. 2020.
    PubMed-indexed articleClinical practice guideline2020

    ACR Appropriateness Criteria Thoracic Outlet Syndrome. 2020. doi:10.1016/j.jacr.2020.01.029.

    PubMedDOI
  3. 3.
    EANS consensus on thoracic outlet syndrome diagnosis (Part 1). 2022.
    PubMed-indexed articleClinical practice guideline2022

    EANS consensus on thoracic outlet syndrome diagnosis (Part 1). 2022. doi:10.1007/s00701-022-05291-x.

    PubMedDOI
  4. 4.
    International Thoracic Outlet Syndrome Society consensus on neurogenic TOS. 2024.
    DOI publisher routeClinical practice guideline2024

    International Thoracic Outlet Syndrome Society consensus on neurogenic TOS. 2024. doi:10.1016/j.jvscit.2024.101542.

    DOI
  5. 5.
    Outcomes after Paget-Schroetter syndrome treatment: systematic review and meta-analysis. 2023.
    DOI publisher routeMeta-analysis / systematic review2023

    Outcomes after Paget-Schroetter syndrome treatment: systematic review and meta-analysis. 2023. doi:10.1016/j.ejvs.2023.08.065.

    DOI
  6. 6.
    Catheter-directed thrombolysis for venous thoracic outlet syndrome. 2021.
    PubMed-indexed articleRegistry / cohort2021

    Catheter-directed thrombolysis for venous thoracic outlet syndrome. 2021. doi:10.1016/j.jvsv.2021.01.013.

    PubMedDOI
  7. 7.
    Arterial thoracic outlet syndrome: clinical presentation and management review. 2021.
    PubMed-indexed articleReview2021

    Arterial thoracic outlet syndrome: clinical presentation and management review. 2021. doi:10.1016/j.avsg.2020.10.077.

    PubMedDOI
  8. 8.
    Comprehensive review of thoracic outlet syndrome. 2019.
    PubMed-indexed articleReview2019

    Comprehensive review of thoracic outlet syndrome. 2019. doi:10.1016/j.jvs.2019.04.501.

    PubMedDOI
  9. 9.
    Postoperative follow-up after venous thoracic outlet syndrome decompression. 2018.
    PubMed-indexed articleRegistry / cohort2018

    Postoperative follow-up after venous thoracic outlet syndrome decompression. 2018. doi:10.1016/j.jvs.2017.12.069.

    PubMedDOI
  10. 10.
    Thoracic Outlet Syndrome Part II: Consensus on the Management of Neurogenic Thoracic Outlet Syndrome by the European Association of Neurosurgical Societies' Section of Peripheral Nerve Surgery.
    PubMed-indexed articleClinical practice guideline2023

    Thoracic Outlet Syndrome Part II: Consensus on the Management of Neurogenic Thoracic Outlet Syndrome by the European Association of Neurosurgical Societies' Section of Peripheral Nerve Surgery. doi:10.1227/neu.0000000000002232.

    PubMedDOI
  11. 11.
    Surgical approaches for thoracic outlet syndrome. 2023.
    PubMed-indexed articleReview2023

    Surgical approaches for thoracic outlet syndrome. 2023. doi:10.1016/j.thorsurg.2023.04.002.

    PubMedDOI

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