Objective:

To quantify the azygos-hemiazygos pathway in patients with renal cell carcinoma (RCC) and inferior vena cava (IVC) tumor thrombus by measuring maximum venous width and explore its significance in preoperative surgical planning.

Key Findings:

• The azygos-hemiazygos pathway serves as a compensatory venous drainage route in patients with RCC and VTT, potentially influencing surgical outcomes.
• Quantifying the maximum venous width at the aortic hiatus level can help predict surgical difficulty and intraoperative blood loss, aiding in preoperative planning.
• Temporary clamping of the azygos-hemiazygos pathway may represent a viable strategy to reduce intraoperative bleeding.

Interpretation:

The status of the azygos-hemiazygos pathway is a critical factor in surgical planning for patients with RCC and VTT, as it may significantly influence intraoperative outcomes and strategies.

Limitations:

• The study is retrospective and may be subject to selection bias, which could affect the generalizability of the findings.
• The definition of massive hemorrhage is not standardized and may vary across different surgical contexts, complicating comparisons.

Conclusion:

Assessing the azygos-hemiazygos pathway can provide valuable insights for surgical strategies in managing RCC with VTT, potentially improving patient outcomes by informing surgical approaches.