CTICasesOnyx Embolic Material Mimicking Vascular Calcification or Foreign Body
Imaging findings
Chest radiographs show high-density, branching, tubular radiopaque material in the paraspinal and posterior mediastinal regions. CT confirms this represents liquid embolic agent within vessels supplying a large renal cell carcinoma spinal metastasis.
Key takeaways
Onyx is a non-adhesive liquid embolic agent commonly used for preoperative embolization of hypervascular spinal tumors, such as renal cell carcinoma metastases, to limit intraoperative hemorrhage. On imaging, this material is highly radiopaque and has a branching, vascular structure that can mimic extensive vascular calcifications, surgical hardware, or foreign bodies.
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