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Arteriovenous fistula simulating arteriovenous malformation.
H H Trout1, A L Tievsky, K G Rieth
1Department of Surgery, George Washington University Medical Center, Washington, D.C.
Summary
Accurate diagnosis between arteriovenous malformations (AVMs) and arteriovenous fistulas (AVFs) is crucial. This case highlights how treating an AVF as an AVM with arterial ligation was ineffective, delaying proper fistula occlusion.
Area of Science:
- Vascular Surgery
- Interventional Radiology
- Diagnostic Imaging
Background:
- Distinguishing between arteriovenous malformations (AVMs) and arteriovenous fistulas (AVFs) is critical for effective treatment.
- AVMs are congenital, complex lesions, while AVFs are typically acquired, with a single arterial-venous communication.
Observation:
- A 36-year-old male with a 20-year misdiagnosis of AVM was treated with arterial ligations, offering only temporary relief.
- Impaired angioaccess due to previous interventions delayed the correct diagnosis of an arteriovenous fistula, likely post-tonsillectomy.
- Successful occlusion of the arteriovenous fistula using detachable balloons led to the resolution of the mass and headaches.
Findings:
- Arteriography is key in differentiating AVFs (single communication) from AVMs (multiple communications).
- Proximal arterial ligation for presumed AVMs can be ineffective and detrimental, promoting collateralization and hindering future diagnostic access.
- Arteriovenous fistulas are curable by obliterating the single communication, unlike aggressive AVMs requiring complete excision.
Implications:
- Accurate differential diagnosis between AVFs and AVMs is paramount for appropriate patient management.
- This case underscores the limitations of arterial ligation and the importance of precise diagnosis for vascular anomalies.
- Endovascular occlusion offers a definitive treatment for arteriovenous fistulas, contrasting with the surgical challenges of arteriovenous malformations.