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<p>The reno-hemiazygos venous connection is a rare developmental variant that arises from the persistence of transient embryonic communications. A 75-year-old male underwent contrast-enhanced abdominal computed tomography (CT) for evaluation of abdominal pain. Imaging revealed a normal left renal vein (LRV) draining into the inferior vena cava (IVC) and an additional posterior connection from the LRV to the hemiazygos vein. No evidence of IVC obstruction or renal abnormality was present. Recognition of a reno-hemiazygos connection is important to prevent misinterpretation as a pathologic retroperitoneal vessel or lymphadenopathy, to appreciate its potential role as a collateral pathway in cases of IVC obstruction or Budd–Chiari syndrome, and to aid in preoperative planning to minimize the risk of vascular injury or bleeding during retroperitoneal or renal surgeries..</p>

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Reno-hemiazygos venous connection identified on contrast-enhanced abdominal CT: a developmental variant

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Vedat Yaman

摘要

The reno-hemiazygos venous connection is a rare developmental variant that arises from the persistence of transient embryonic communications. A 75-year-old male underwent contrast-enhanced abdominal computed tomography (CT) for evaluation of abdominal pain. Imaging revealed a normal left renal vein (LRV) draining into the inferior vena cava (IVC) and an additional posterior connection from the LRV to the hemiazygos vein. No evidence of IVC obstruction or renal abnormality was present. Recognition of a reno-hemiazygos connection is important to prevent misinterpretation as a pathologic retroperitoneal vessel or lymphadenopathy, to appreciate its potential role as a collateral pathway in cases of IVC obstruction or Budd–Chiari syndrome, and to aid in preoperative planning to minimize the risk of vascular injury or bleeding during retroperitoneal or renal surgeries..