CTICasesPersistent left superior vena cava with absent right superior vena cava
Imaging findings
Chest CT demonstrates complete absence of the right superior vena cava. A persistent left superior vena cava is present, which drains into the coronary sinus. Venous blood from the right side of the body crosses the midline via the accessory hemiazygos vein to drain into the left superior vena cava.
Key takeaways
A persistent left superior vena cava with absent right superior vena cava is a rare congenital vascular variant. It typically drains benignly into the coronary sinus, but is important to recognize for central venous access or cardiothoracic surgery.
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