CTICasesIntravascular Tumor Thrombus
Imaging findings
CT chest shows multiple finger-like filling defects filling the pulmonary veins and segmental branches, directly contiguous with a thyroid malignancy.
Key takeaways
Intravascular tumor thrombus occurs when a malignant tumor (such as thyroid or renal cell carcinoma) directly invades and grows along the vascular lumen. On CT, this presents as filling defects that mimic acute pulmonary embolism, but can be distinguished by direct contiguity with the primary tumor mass.
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