Inferior Vena Cava Anomalies and Deep Venous Thrombosis

The inferior vena cava (IVC) is the principal conduit for venous return from the lower body. Congenital anomalies of the IVC arise from perturbations in embryological development, leading to duplication, left-sided persistence, interruption with azygos continuation or complete agenesis of the infrarenal segment. While many individuals remain asymptomatic, altered venous architecture predisposes to stasis and an elevated risk of deep venous thrombosis (DVT), often presenting with bilateral iliofemoral thrombi in young adults. Clinical recognition hinges on imaging modalities—contrast-enhanced CT or magnetic resonance venography—to delineate aberrant channels and collateral pathways. Management strategies combine long-term anticoagulation, catheter-directed thrombolysis and, in selected cases, endovascular reconstruction or lifelong surveillance. A nuanced understanding of these anomalies is vital for surgical planning, prevention of iatrogenic injury and optimisation of thromboprophylaxis.

Research from Nature Portfolio

Recent meta-analytical work has quantified the prevalence of renal vein variations that interface directly with IVC anomalies. By pooling data from over one hundred imaging and cadaveric studies, researchers have established that retroaortic and circumaortic renal veins occur in approximately 3% and 3.5% of the population respectively, while multiple renal veins are observed in nearly 17%. These findings underscore the importance of preoperative mapping of renal-IVC junctions, as variant configurations may exacerbate venous congestion and influence the site and severity of DVT.

Inferior Vena Cava Anomalies and Deep Venous Thrombosis publication trend

The graph below shows the total number of articles in inferior vena cava anomalies and deep venous thrombosis across all publications each year (not limited to Nature Index journals).

Technical terms

Inferior vena cava: The large vein conveying deoxygenated blood from the lower body to the right atrium.

Deep venous thrombosis: Formation of a blood clot within the deep veins, typically of the lower limbs.

Agenesis: Complete failure of an organ or vessel to develop during embryogenesis.

Azygos continuation: An absence or interruption of the IVC in its infrarenal or suprarenal segment, with venous return rerouted via the azygos-hemiazygos system.

Collateral circulation: Secondary vascular pathways that develop to bypass an obstructed or absent primary vessel.

Circumaortic renal vein: A renal vein that encircles the aorta, presenting both anterior and posterior limbs around the vessel.

References

1. Anatomical variants of renal veins: A meta-analysis of prevalence. Scientific Reports (2019).
2. The inferior vena cava: anatomical variants and acquired pathologies. Insights into Imaging (2021).
3. Elevated risk of thrombophilia in agenesis of the vena cava as a factor for deep vein thrombosis. Orphanet Journal of Rare Diseases (2015).
4. Deep Venous Thrombosis of the Leg, Associated with Agenesis of the Infrarenal Inferior Vena Cava and Hypoplastic Left Kidney (KILT Syndrome) in a 14‐Year‐Old Child. Case Reports in Pediatrics (2015).