Can cerebrovascular malformations have pulmonary manifestations?

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Last updated: October 16, 2026 • View editorial policy

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Yes, cerebrovascular malformations can have pulmonary manifestations, most commonly through hereditary hemorrhagic telangiectasia (HHT).

Patients with cerebrovascular malformations, particularly arteriovenous malformations (AVMs), should be screened for pulmonary arteriovenous malformations (PAVMs), especially when HHT is suspected, as 10-20% of HHT patients will develop at least one AVM during their lifetime and 62.5% of patients with cerebral AVMs also have pulmonary AVMs 1, 2, 3.

The Connection Between Cerebral and Pulmonary Vascular Malformations

HHT as the Primary Link

The association between cerebrovascular and pulmonary malformations occurs predominantly through hereditary hemorrhagic telangiectasia (HHT), an autosomal-dominant vascular dysplasia 3. In patients with HHT:

  • Between 10-20% will develop at least one cerebral AVM during their lifetime 2
  • 62.5% of patients with cerebral AVMs also have pulmonary AVMs 3
  • The presence of a pulmonary AVM significantly increases the likelihood of harboring a cerebral vascular malformation 3

Clinical Significance of PAVMs

PAVMs create structurally abnormal vascular communications providing continuous right-to-left shunts between pulmonary arteries and veins 1. This has critical implications:

Life-threatening complications include:

  • >1 in 4 patients will experience paradoxical embolic stroke, abscess, or myocardial infarction 1
  • Life-threatening hemorrhage affects 1 in 100 women during pregnancy 1
  • Recurrent cerebral embolism can occur despite anticoagulation 4

Rare Cases Without HHT

While uncommon, cerebral and pulmonary AVMs can coexist without HHT, though this is exceptionally rare 5, 6. These cases still require the same vigilant screening and management approach.

Screening Recommendations

When cerebrovascular malformations are identified, screen for pulmonary involvement by:

  • Contrast-enhanced chest CT to identify PAVMs 4
  • Consider screening all patients with cerebral AVMs for pulmonary AVMs, particularly if:
    • Family history suggests HHT
    • Multiple cerebral AVMs are present (one-third of HHT patients have multiple CVMs) 3
    • Unexplained hypoxemia or dyspnea exists
    • History of recurrent infections or paradoxical emboli 1

Management Implications

Percutaneous transcatheter embolization is the primary treatment for PAVMs when intervention is indicated 4. The decision should be guided by:

  • Feeding artery size
  • Patient symptoms
  • Risk of paradoxical embolism

Critical pitfall: PAVMs are frequently asymptomatic and under-appreciated, representing a challenging condition for healthcare professionals 1. The bleeding risk for cerebral AVMs in HHT patients (0.38-0.72% per year) is lower than sporadic AVMs, but the combined cerebral and pulmonary risks make screening essential 3.

Key Clinical Pearls

  • Female patients are more commonly affected than males 3
  • Most cerebral AVMs in HHT are low-grade (Spetzler-Martin Grade I or II), frequently multiple, and have superficial venous drainage 3
  • Hemorrhagic transformation from cerebral events is not an absolute contraindication to PAVM embolization—careful risk assessment is required 4
  • Timely diagnosis and treatment are essential to prevent disabling recurrent cerebrovascular events 4

References

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