CTICasesLow-Grade Chondrosarcoma of the Left Main Bronchus
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Imaging findings
A middle-aged man with respiratory complaints had a chest radiograph initially called normal, but the lateral view subtly effaced the left main upper lobe bronchus continuum. CT revealed a large, heterogeneous, slow-growing mass with mineralization (cartilage/bone) centered near the carina, severely narrowing the left main bronchus. Biopsy confirmed low-grade chondrosarcoma.
Key takeaways
Low-grade chondrosarcomas can arise from cartilage within the trachea or main bronchi. They are typically slow-growing and can contain calcification, often causing chronic airway obstruction. Diagnosis can be challenging due to subtle radiographic findings and low metabolic activity on PET. They must be differentiated from fibrosing mediastinitis, which typically encases structures rather than forming a discrete mass.
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