CTICasesEwing Sarcoma Metastasis invaginating a Pulmonary Vein
Imaging findings
CT demonstrates a pulmonary nodule from metastatic Ewing sarcoma that has grown into and invaginated an adjacent pulmonary vein. The vein is severely dilated, and there is associated systemic arterial supply to the mass, causing a systemic-to-pulmonary venous shunt.
Key takeaways
Metastatic tumors, particularly sarcomas, can show a propensity for intravascular invasion. Growth into a pulmonary vein can cause marked dilatation of the vessel and create systemic-to-pulmonary venous shunting, mimicking a primary vascular malformation.
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