CTICasesPulmonary Artery Tumor Thrombus
Imaging findings
CT angiography shows a massive, lobulated filling defect in the left pulmonary artery extending into its main branches, associated with hypertrophied bronchial artery collaterals and focal calcification. Tissue biopsy confirmed metastatic choriocarcinoma presenting as tumor emboli.
Key takeaways
Pulmonary tumor embolism or tumor thrombus is a rare manifestation of metastatic malignancy (such as choriocarcinoma, renal cell carcinoma, or hepatoma). The presence of neovascularity and hypertrophied bronchial collateral arteries on CT suggests a tumor thrombus rather than acute thromboembolism.
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