CTICasesHigh-Flow Mediastinal Vascular Malformation (Azygos to Left Atrial Communication)
Imaging findings
CT imaging in a renal failure patient on dialysis reveals a large, vascular mass-like pouch in the posterior mediastinum. Contrast injection demonstrates immediate, direct filling from the azygos vein into this vascular pouch, which subsequently drains directly into the left atrium or adjacent pulmonary vein.
Key takeaways
High-flow vascular malformations of the mediastinum are rare and can be difficult to classify using older terminology such as hemangioma. Azygos-to-left atrial communication is a highly unusual vascular anomaly that can act as a high-flow shunt. Long-term surveillance may show stability, but clinical intervention is often avoided unless symptomatic.
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