CTICasesObstructive left upper lobe collapse from melanoma metastasis
Imaging findings
Chest radiograph and CT show left upper lobe collapse with a luftsichel sign, caused by an obstructing melanoma metastasis in the left hilum. Left-sided pulmonary emboli are also present.
Key takeaways
Endobronchial or hilar metastasis from melanoma is a known cause of lobar collapse. The luftsichel sign is a classic radiographic sign of left upper lobe collapse, representing the superior segment of the left lower lobe hyperextending around the collapsed upper lobe.
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