CTICasesEndoscopic Lung Volume Reduction Coils
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Imaging findings
Chest CT in a patient with alpha-1 antitrypsin deficiency and severe emphysema shows multiple dense, curved, metallic foreign bodies distributed throughout the lung parenchyma. These self-deploying nitinol coils are located both within and adjacent to the distal bronchovascular pathways, showing no associated parenchymal reaction.
Key takeaways
Endoscopic lung volume reduction coils, such as RENEU coils, are nitinol implants used in clinical trials to treat severe emphysema by restoring the elastic recoil and reducing compliance of hyperinflated lungs. Recognizing the normal appearance of these self-deploying coils on CT is essential to avoid misinterpreting them as aspirates, hardware failures, or other iatrogenic foreign bodies.
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