What is inferior vena cava (IVC) atresia?

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Last updated: March 25, 2026 • View editorial policy

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What is IVC Atresia?

IVC atresia is a rare congenital vascular malformation characterized by the complete absence or interruption of the inferior vena cava, typically below the renal veins, with compensatory venous drainage occurring through collateral vessels such as the azygos and hemiazygos systems. 1, 2

Epidemiology and Demographics

  • Predominantly affects males with a male-to-female ratio of approximately 2:1 (64.1% male vs 35.8% female) 1
  • However, females are more likely to have congenital IVC atresia associated with other congenital anomalies (46.1% in females vs 21.3% in males) 1
  • Mean age at presentation is 27.9 years (range 0-77 years), with most patients presenting in their early thirties 1, 3
  • Found in approximately 5% of unprovoked lower extremity DVT cases in patients under 30 years of age 3

Pathophysiology

  • The absence of the IVC forces blood to return through collateral circulation, primarily via enlarged azygos and hemiazygos veins 2, 3
  • Despite compensatory collateral development, venous drainage of the lower limbs remains insufficient, leading to venous stasis and predisposition to thrombosis 3
  • The condition can be isolated or associated with other congenital anomalies such as kidney abnormalities (KILT syndrome - kidney and IVC abnormalities with leg thrombosis) 4

Clinical Presentation

Most patients (64.3%) present with deep vein thrombosis (DVT), with the following characteristics: 1

  • Iliac veins are most commonly affected (65.7% of DVT cases) 1
  • Leg pain and swelling are the most common symptoms in both sexes 1
  • Patients often have a history of major physical exertion preceding symptom onset 3
  • Extensive or bilateral DVTs are characteristic findings 5, 3
  • Other presentations include fatigue, lower limb edema, and episodes of presyncope 2

Important clinical pitfall: Many cases are diagnosed incidentally on imaging or only after a thrombotic event occurs, as the clinical presentation is non-specific 2

Diagnostic Approach

  • Doppler ultrasound diagnoses the DVT but does not visualize IVC atresia 6
  • Contrast-enhanced CT or MRI/MRA is required to diagnose IVC atresia and identify other congenital IVC anomalies 6
  • Screen for hereditary thrombophilias (antithrombin III deficiency, prothrombin gene mutation, etc.) as these compound the thrombotic risk 5, 6
  • Evaluate the kidneys when IVC atresia is confirmed, particularly looking for left kidney abnormalities in KILT syndrome (64.7% have kidney abnormalities) 4

Associated Conditions

  • Hereditary thrombophilias significantly increase recurrent DVT risk when present with IVC atresia 6
  • KILT syndrome: 64.7% of patients with IVC atresia have left kidney abnormalities, predominantly affecting males (76.5%) with median age 24 years 4

Prognosis and Mortality

  • No mortality reported with isolated IVC atresia in either medical or surgical treatment groups 1
  • However, mortality is 11.7% in patients with IVC atresia associated with other congenital anomalies 1
  • Open and endovascular surgical interventions have been performed in 18.3% of reviewed patients with acceptable mid-term patency and symptomatic relief 1

Treatment Considerations

  • Long-term anticoagulation is typically required for primary prevention of thrombotic events, especially when hereditary thrombophilia is present 2, 6, 4
  • Surgical measures (open or endovascular) may be effective for symptomatic refractory cases 1, 4
  • Risk factor control and monitoring of kidney function are essential in KILT syndrome cases 4

References

1
Research

Systematic review of inferior vena cava atresia.

Journal of vascular surgery. Venous and lymphatic disorders, 2023

2
Research

Inferior Vena Cava Atresia: A Rare Vascular Malformation.

European journal of case reports in internal medicine, 2023

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.