CTICasesEndobronchial Metastases from Colon Adenocarcinoma
Imaging findings
Chest radiograph demonstrates large, bilateral, discrete, posterior-predominant perihilar masses. Chest CT reveals that these masses are actually very large, lumpy, expansile endobronchial lesions originating in and distending the left lower lobe bronchi and right middle/lower lobe bronchi. A subcarinal mass represents either a local metastasis or a nodal deposit.
Key takeaways
While parenchymal nodules are the most common form of pulmonary metastasis, endobronchial metastases can occur, most frequently from colorectal carcinoma, renal cell carcinoma, breast cancer, and melanoma. These metastases grow inside the airways, causing bronchial expansion and distal atelectasis or mucous plugging, and can clinically mimic primary bronchogenic carcinomas.
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